diff --git a/packages/preview-server/package.json b/packages/preview-server/package.json
index ebec48a7b3..2b8299694c 100644
--- a/packages/preview-server/package.json
+++ b/packages/preview-server/package.json
@@ -13,6 +13,7 @@
   },
   "main": "./index.mjs",
   "dependencies": {
+    "@t3-oss/env-nextjs": "0.13.10",
     "next": "16.1.1"
   },
   "devDependencies": {
@@ -79,7 +80,7 @@
     "tailwindcss": "4.1.17",
     "typescript": "5.8.3",
     "use-debounce": "10.0.6",
-    "zod": "4.1.12"
+    "zod": "4.3.5"
   },
   "license": "MIT",
   "repository": {
diff --git a/packages/preview-server/scripts/dev.mts b/packages/preview-server/scripts/dev.mts
index dbb1bc095c..5f62fc5f03 100644
--- a/packages/preview-server/scripts/dev.mts
+++ b/packages/preview-server/scripts/dev.mts
@@ -26,7 +26,9 @@ await fs.writeFile(
 EMAILS_DIR_ABSOLUTE_PATH=${emailsDirectoryPath}
 USER_PROJECT_LOCATION=${previewServerRoot}
 PREVIEW_SERVER_LOCATION=${previewServerRoot}
-NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT=true`,
+NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT=true
+COMPATIBILITY_EMAIL_CLIENTS=gmail,apple-mail,outlook,yahoo
+`,
   'utf8',
 );
 
diff --git a/packages/preview-server/src/actions/email-validation/caniemail-data.ts b/packages/preview-server/src/actions/email-validation/caniemail-data.ts
index 35fb5a8c9f..fd9d275396 100644
--- a/packages/preview-server/src/actions/email-validation/caniemail-data.ts
+++ b/packages/preview-server/src/actions/email-validation/caniemail-data.ts
@@ -1,4 +1,4 @@
-import type { SupportEntry } from "./check-compatibility";
+import type { SupportEntry } from "../../utils/caniemail/email-clients";
 
 export const nicenames = {
   "family": {
diff --git a/packages/preview-server/src/actions/email-validation/check-compatibility.ts b/packages/preview-server/src/actions/email-validation/check-compatibility.ts
index 5852040d26..541c991ae5 100644
--- a/packages/preview-server/src/actions/email-validation/check-compatibility.ts
+++ b/packages/preview-server/src/actions/email-validation/check-compatibility.ts
@@ -11,6 +11,10 @@ import {
   doesPropertyHaveLocation,
   getUsedStyleProperties,
 } from '../../utils/caniemail/ast/get-used-style-properties';
+import {
+  relevantEmailClients,
+  type SupportEntry,
+} from '../../utils/caniemail/email-clients';
 import type {
   CompatibilityStats,
   SupportStatus,
@@ -33,90 +37,6 @@ export interface CompatibilityCheckingResult {
   statsPerEmailClient: CompatibilityStats['perEmailClient'];
 }
 
-export type EmailClient =
-  | 'gmail'
-  | 'outlook'
-  | 'yahoo'
-  | 'apple-mail'
-  | 'aol'
-  | 'thunderbird'
-  | 'microsoft'
-  | 'samsung-email'
-  | 'sfr'
-  | 'orange'
-  | 'protonmail'
-  | 'hey'
-  | 'mail-ru'
-  | 'fastmail'
-  | 'laposte'
-  | 't-online-de'
-  | 'free-fr'
-  | 'gmx'
-  | 'web-de'
-  | 'ionos-1and1'
-  | 'rainloop'
-  | 'wp-pl';
-
-export type Platform =
-  | 'desktop-app'
-  | 'desktop-webmail'
-  | 'mobile-webmail'
-  | 'webmail'
-  | 'ios'
-  | 'android'
-  | 'windows'
-  | 'macos'
-  | 'windows-mail'
-  | 'outlook-com';
-
-export type SupportEntryCategory = 'html' | 'css' | 'image' | 'others';
-
-export interface SupportEntry {
-  slug: string;
-  title: string;
-  description: string | null;
-  url: string;
-  category: SupportEntryCategory;
-  tags: string[];
-  keywords: string | null;
-  last_test_date: string;
-  test_url: string;
-  test_results_url: string | null;
-  stats: Partial<
-    Record<
-      EmailClient,
-      Partial<
-        Record<
-          Platform,
-          /*
-            This last Record<string, string> has only one key, as the
-            ordered version of caniemail's data is meant to be something like:
-           
-            [
-              { "1.0": "u" },
-              { "2.0": "y" },
-              { "3.0": "p #1" },
-            ]
-           
-            So only one key for each object inside of this array, TypeScript can't really
-            describe this though AFAIK.
-          */
-          Record</* version */ string, string>[]
-        >
-      >
-    >
-  >;
-  notes: string | null;
-  notes_by_num: Record<number, string> | null;
-}
-
-const relevantEmailClients: EmailClient[] = [
-  'gmail',
-  'apple-mail',
-  'outlook',
-  'yahoo',
-];
-
 export const checkCompatibility = async (
   reactCode: string,
   emailPath: string,
diff --git a/packages/preview-server/src/actions/export-single-template.ts b/packages/preview-server/src/actions/export-single-template.ts
index eb6f0ccd10..3b82521fd9 100644
--- a/packages/preview-server/src/actions/export-single-template.ts
+++ b/packages/preview-server/src/actions/export-single-template.ts
@@ -2,7 +2,7 @@
 
 import { Resend } from 'resend';
 import { z } from 'zod';
-import { resendApiKey } from '../app/env';
+import { env } from '../app/env';
 import { baseActionClient } from './safe-action';
 
 export const exportSingleTemplate = baseActionClient
@@ -16,7 +16,7 @@ export const exportSingleTemplate = baseActionClient
     }),
   )
   .action(async ({ parsedInput }) => {
-    const resend = new Resend(resendApiKey);
+    const resend = new Resend(env.RESEND_API_KEY);
 
     const response = await resend.templates.create({
       name: parsedInput.name,
diff --git a/packages/preview-server/src/actions/get-email-path-from-slug.ts b/packages/preview-server/src/actions/get-email-path-from-slug.ts
index de15ee1e7c..2d4e461cc2 100644
--- a/packages/preview-server/src/actions/get-email-path-from-slug.ts
+++ b/packages/preview-server/src/actions/get-email-path-from-slug.ts
@@ -3,13 +3,13 @@
 import fs from 'node:fs';
 import path from 'node:path';
 import { cache } from 'react';
-import { emailsDirectoryAbsolutePath } from '../app/env';
+import { env } from '../app/env';
 
 export const getEmailPathFromSlug = cache(async (slug: string) => {
   if (['.tsx', '.jsx', '.ts', '.js'].includes(path.extname(slug)))
-    return path.join(emailsDirectoryAbsolutePath, slug);
+    return path.join(env.EMAILS_DIR_ABSOLUTE_PATH, slug);
 
-  const pathWithoutExtension = path.join(emailsDirectoryAbsolutePath, slug);
+  const pathWithoutExtension = path.join(env.EMAILS_DIR_ABSOLUTE_PATH, slug);
 
   if (fs.existsSync(`${pathWithoutExtension}.tsx`)) {
     return `${pathWithoutExtension}.tsx`;
diff --git a/packages/preview-server/src/actions/render-email-by-path.tsx b/packages/preview-server/src/actions/render-email-by-path.tsx
index fbbc4bb41c..350e4e1da9 100644
--- a/packages/preview-server/src/actions/render-email-by-path.tsx
+++ b/packages/preview-server/src/actions/render-email-by-path.tsx
@@ -5,12 +5,7 @@ import path from 'node:path';
 import logSymbols from 'log-symbols';
 import ora, { type Ora } from 'ora';
 import type React from 'react';
-import {
-  isBuilding,
-  isPreviewDevelopment,
-  previewServerLocation,
-  userProjectLocation,
-} from '../app/env';
+import { env } from '../app/env';
 import { convertStackWithSourceMap } from '../utils/convert-stack-with-sourcemap';
 import { createJsxRuntime } from '../utils/create-jsx-runtime';
 import { getEmailComponent } from '../utils/get-email-component';
@@ -36,8 +31,8 @@ export interface RenderedEmailMetadata {
 export type EmailRenderingResult =
   | RenderedEmailMetadata
   | {
-      error: ErrorObject;
-    };
+    error: ErrorObject;
+  };
 
 const cache = new Map<string, EmailRenderingResult>();
 
@@ -100,7 +95,10 @@ export const renderEmailByPath = async (
 
   const emailFilename = path.basename(emailPath);
   let spinner: Ora | undefined;
-  if (!isBuilding && !isPreviewDevelopment) {
+  if (
+    env.NEXT_PUBLIC_IS_BUILDING === 'false' &&
+    env.NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT === 'false'
+  ) {
     logBufferer.buffer();
     errorBufferer.buffer();
     infoBufferer.buffer();
@@ -115,11 +113,11 @@ export const renderEmailByPath = async (
 
   const timeBeforeEmailBundled = performance.now();
   const originalJsxRuntimePath = path.resolve(
-    previewServerLocation,
+    env.PREVIEW_SERVER_LOCATION,
     'jsx-runtime',
   );
   const jsxRuntimePath = await createJsxRuntime(
-    userProjectLocation,
+    env.USER_PROJECT_LOCATION,
     originalJsxRuntimePath,
   );
   const componentResult = await getEmailComponent(emailPath, jsxRuntimePath);
diff --git a/packages/preview-server/src/app/env.ts b/packages/preview-server/src/app/env.ts
index d16b317581..2bf9ff48b6 100644
--- a/packages/preview-server/src/app/env.ts
+++ b/packages/preview-server/src/app/env.ts
@@ -1,17 +1,28 @@
-/** ONLY ACCESSIBLE ON THE SERVER */
-export const userProjectLocation = process.env.USER_PROJECT_LOCATION!;
+import { createEnv } from '@t3-oss/env-nextjs';
+import { z } from 'zod';
 
-/** ONLY ACCESSIBLE ON THE SERVER */
-export const previewServerLocation = process.env.PREVIEW_SERVER_LOCATION!;
-
-/** ONLY ACCESSIBLE ON THE SERVER */
-export const emailsDirectoryAbsolutePath =
-  process.env.EMAILS_DIR_ABSOLUTE_PATH!;
-
-/** ONLY ACCESSIBLE ON THE SERVER */
-export const resendApiKey = process.env.RESEND_API_KEY;
-
-export const isBuilding = process.env.NEXT_PUBLIC_IS_BUILDING === 'true';
-
-export const isPreviewDevelopment =
-  process.env.NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT === 'true';
+export const env = createEnv({
+  server: {
+    USER_PROJECT_LOCATION: z.string(),
+    PREVIEW_SERVER_LOCATION: z.string(),
+    EMAILS_DIR_ABSOLUTE_PATH: z.string(),
+    RESEND_API_KEY: z.string().optional(),
+    COMPATIBILITY_EMAIL_CLIENTS: z.string(),
+  },
+  client: {
+    NEXT_PUBLIC_IS_BUILDING: z
+      .union([z.literal('true'), z.literal('false')])
+      .optional()
+      .default('false'),
+    NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT: z
+      .union([z.literal('true'), z.literal('false')])
+      .optional()
+      .default('false'),
+  },
+  skipValidation: true,
+  experimental__runtimeEnv: {
+    NEXT_PUBLIC_IS_BUILDING: process.env.NEXT_PUBLIC_IS_BUILDING,
+    NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT:
+      process.env.NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT,
+  },
+});
diff --git a/packages/preview-server/src/app/layout.tsx b/packages/preview-server/src/app/layout.tsx
index 4a99619456..5f0434bc39 100644
--- a/packages/preview-server/src/app/layout.tsx
+++ b/packages/preview-server/src/app/layout.tsx
@@ -3,7 +3,7 @@ import './globals.css';
 import type { Metadata } from 'next';
 import { EmailsProvider } from '../contexts/emails';
 import { getEmailsDirectoryMetadata } from '../utils/get-emails-directory-metadata';
-import { emailsDirectoryAbsolutePath } from './env';
+import { env } from './env';
 import { inter, sfMono } from './fonts';
 
 export const metadata: Metadata = {
@@ -18,12 +18,12 @@ export default async function RootLayout({
   children: React.ReactNode;
 }) {
   const emailsDirectoryMetadata = await getEmailsDirectoryMetadata(
-    emailsDirectoryAbsolutePath,
+    env.EMAILS_DIR_ABSOLUTE_PATH,
   );
 
   if (typeof emailsDirectoryMetadata === 'undefined') {
     throw new Error(
-      `Could not find the emails directory specified under ${emailsDirectoryAbsolutePath}!`,
+      `Could not find the emails directory specified under ${env.EMAILS_DIR_ABSOLUTE_PATH}!`,
     );
   }
 
diff --git a/packages/preview-server/src/app/page.tsx b/packages/preview-server/src/app/page.tsx
index 93b604aea0..72167acd69 100644
--- a/packages/preview-server/src/app/page.tsx
+++ b/packages/preview-server/src/app/page.tsx
@@ -4,11 +4,11 @@ import Link from 'next/link';
 import { Button, Heading, Text } from '../components';
 import CodeSnippet from '../components/code-snippet';
 import { Shell } from '../components/shell';
-import { emailsDirectoryAbsolutePath } from './env';
+import { env } from './env';
 import logo from './logo.png';
 
 export default function Home() {
-  const baseEmailsDirectoryName = path.basename(emailsDirectoryAbsolutePath);
+  const baseEmailsDirectoryName = path.basename(env.EMAILS_DIR_ABSOLUTE_PATH);
 
   return (
     <Shell>
diff --git a/packages/preview-server/src/app/preview/[...slug]/page.tsx b/packages/preview-server/src/app/preview/[...slug]/page.tsx
index 36f0674da5..512c110135 100644
--- a/packages/preview-server/src/app/preview/[...slug]/page.tsx
+++ b/packages/preview-server/src/app/preview/[...slug]/page.tsx
@@ -16,12 +16,9 @@ import { ToolbarProvider } from '../../../contexts/toolbar';
 import { getEmailsDirectoryMetadata } from '../../../utils/get-emails-directory-metadata';
 import { getLintingSources, loadLintingRowsFrom } from '../../../utils/linting';
 import { loadStream } from '../../../utils/load-stream';
-import {
-  emailsDirectoryAbsolutePath,
-  isBuilding,
-  resendApiKey,
-} from '../../env';
+import { env } from '../../env';
 import Preview from './preview';
+import type { Metadata } from 'next';
 
 export const dynamicParams = true;
 
@@ -41,12 +38,12 @@ export default async function Page({
   // ex: ['authentication', 'verify-password.tsx']
   const slug = decodeURIComponent(params.slug.join('/'));
   const emailsDirMetadata = await getEmailsDirectoryMetadata(
-    emailsDirectoryAbsolutePath,
+    env.EMAILS_DIR_ABSOLUTE_PATH,
   );
 
   if (typeof emailsDirMetadata === 'undefined') {
     throw new Error(
-      `Could not find the emails directory specified under ${emailsDirectoryAbsolutePath}!
+      `Could not find the emails directory specified under ${env.EMAILS_DIR_ABSOLUTE_PATH}!
 
 This is most likely not an issue with the preview server. Maybe there was a typo on the "--dir" flag?`,
     );
@@ -69,7 +66,7 @@ This is most likely not an issue with the preview server. Maybe there was a typo
   let lintingRows: LintingRow[] | undefined;
   let compatibilityCheckingResults: CompatibilityCheckingResult[] | undefined;
 
-  if (isBuilding) {
+  if (env.NEXT_PUBLIC_IS_BUILDING === 'true') {
     if ('error' in serverEmailRenderingResult) {
       throw new Error(serverEmailRenderingResult.error.message, {
         cause: serverEmailRenderingResult.error,
@@ -137,7 +134,9 @@ This is most likely not an issue with the preview server. Maybe there was a typo
         <Suspense>
           <Preview emailTitle={path.basename(emailPath)} />
 
-          <ToolbarProvider hasApiKey={(resendApiKey ?? '').trim().length > 0}>
+          <ToolbarProvider
+            hasApiKey={(env.RESEND_API_KEY ?? '').trim().length > 0}
+          >
             <Toolbar
               serverLintingRows={lintingRows}
               serverSpamCheckingResult={spamCheckingResult}
@@ -154,7 +153,7 @@ export async function generateMetadata({
   params,
 }: {
   params: Promise<PreviewParams>;
-}) {
+}): Promise<Metadata> {
   const { slug } = await params;
 
   return { title: `${path.basename(slug.join('/'))} — React Email` };
diff --git a/packages/preview-server/src/components/toolbar.tsx b/packages/preview-server/src/components/toolbar.tsx
index e843a6f925..d99be61172 100644
--- a/packages/preview-server/src/components/toolbar.tsx
+++ b/packages/preview-server/src/components/toolbar.tsx
@@ -6,7 +6,7 @@ import { usePathname, useRouter, useSearchParams } from 'next/navigation';
 import type { ComponentProps } from 'react';
 import * as React from 'react';
 import type { CompatibilityCheckingResult } from '../actions/email-validation/check-compatibility';
-import { isBuilding } from '../app/env';
+import { env } from '../app/env';
 import { usePreviewContext } from '../contexts/preview';
 import { useToolbarContext } from '../contexts/toolbar';
 import { cn } from '../utils';
@@ -115,7 +115,7 @@ const ToolbarInner = ({
     initialResults: serverCompatibilityResults ?? cachedCompatibilityResults,
   });
 
-  if (!isBuilding) {
+  if (env.NEXT_PUBLIC_IS_BUILDING === 'false') {
     // biome-ignore lint/correctness/useHookAtTopLevel: This is fine since isBuilding does not change at runtime
     React.useEffect(() => {
       (async () => {
@@ -190,7 +190,8 @@ const ToolbarInner = ({
               >
                 <IconInfo size={24} />
               </ToolbarButton>
-              {isBuilding || activeTab === 'resend' ? null : (
+              {env.NEXT_PUBLIC_IS_BUILDING === 'true' ||
+                activeTab === 'resend' ? null : (
                 <ToolbarButton
                   tooltip="Reload"
                   disabled={lintLoading || spamLoading || compatibilityLoading}
diff --git a/packages/preview-server/src/contexts/emails.tsx b/packages/preview-server/src/contexts/emails.tsx
index 8241e6ae6a..beead8c650 100644
--- a/packages/preview-server/src/contexts/emails.tsx
+++ b/packages/preview-server/src/contexts/emails.tsx
@@ -2,14 +2,14 @@
 
 import { createContext, useContext, useState } from 'react';
 import { getEmailsDirectoryMetadataAction } from '../actions/get-emails-directory-metadata-action';
-import { isBuilding, isPreviewDevelopment } from '../app/env';
+import { env } from '../app/env';
 import { useHotreload } from '../hooks/use-hot-reload';
 import type { EmailsDirectory } from '../utils/get-emails-directory-metadata';
 
 const EmailsContext = createContext<
   | {
-      emailsDirectoryMetadata: EmailsDirectory;
-    }
+    emailsDirectoryMetadata: EmailsDirectory;
+  }
   | undefined
 >(undefined);
 
@@ -32,7 +32,10 @@ export const EmailsProvider = (props: {
   const [emailsDirectoryMetadata, setEmailsDirectoryMetadata] =
     useState<EmailsDirectory>(props.initialEmailsDirectoryMetadata);
 
-  if (!isBuilding && !isPreviewDevelopment) {
+  if (
+    env.NEXT_PUBLIC_IS_BUILDING === 'false' &&
+    env.NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT === 'false'
+  ) {
     // biome-ignore lint/correctness/useHookAtTopLevel: this will not change on runtime so it doesn't violate the rules of hooks
     useHotreload(async () => {
       const metadata = await getEmailsDirectoryMetadataAction(
diff --git a/packages/preview-server/src/contexts/preview.tsx b/packages/preview-server/src/contexts/preview.tsx
index fca9da2eb0..b07fba57e5 100644
--- a/packages/preview-server/src/contexts/preview.tsx
+++ b/packages/preview-server/src/contexts/preview.tsx
@@ -5,19 +5,19 @@ import type {
   EmailRenderingResult,
   RenderedEmailMetadata,
 } from '../actions/render-email-by-path';
-import { isBuilding, isPreviewDevelopment } from '../app/env';
+import { env } from '../app/env';
 import { useEmailRenderingResult } from '../hooks/use-email-rendering-result';
 import { useHotreload } from '../hooks/use-hot-reload';
 import { useRenderingMetadata } from '../hooks/use-rendering-metadata';
 
 export const PreviewContext = createContext<
   | {
-      renderedEmailMetadata: RenderedEmailMetadata | undefined;
-      renderingResult: EmailRenderingResult;
+    renderedEmailMetadata: RenderedEmailMetadata | undefined;
+    renderingResult: EmailRenderingResult;
 
-      emailSlug: string;
-      emailPath: string;
-    }
+    emailSlug: string;
+    emailPath: string;
+  }
   | undefined
 >(undefined);
 
@@ -49,7 +49,10 @@ export const PreviewProvider = ({
     serverRenderingResult,
   );
 
-  if (!isBuilding && !isPreviewDevelopment) {
+  if (
+    env.NEXT_PUBLIC_IS_BUILDING === 'false' &&
+    env.NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT === 'false'
+  ) {
     // biome-ignore lint/correctness/useHookAtTopLevel: this will not change on runtime so it doesn't violate the rules of hooks
     useHotreload((changes) => {
       const changeForThisEmail = changes.find((change) =>
diff --git a/packages/preview-server/src/hooks/use-email-rendering-result.ts b/packages/preview-server/src/hooks/use-email-rendering-result.ts
index 3f4c848d87..74b58c3873 100644
--- a/packages/preview-server/src/hooks/use-email-rendering-result.ts
+++ b/packages/preview-server/src/hooks/use-email-rendering-result.ts
@@ -4,7 +4,7 @@ import {
   type EmailRenderingResult,
   renderEmailByPath,
 } from '../actions/render-email-by-path';
-import { isBuilding, isPreviewDevelopment } from '../app/env';
+import { env } from '../app/env';
 import { useEmails } from '../contexts/emails';
 import { containsEmailTemplate } from '../utils/contains-email-template';
 import { useHotreload } from './use-hot-reload';
@@ -19,7 +19,10 @@ export const useEmailRenderingResult = (
 
   const { emailsDirectoryMetadata } = useEmails();
 
-  if (!isBuilding && !isPreviewDevelopment) {
+  if (
+    env.NEXT_PUBLIC_IS_BUILDING === 'false' &&
+    env.NEXT_PUBLIC_IS_PREVIEW_DEVELOPMENT === 'false'
+  ) {
     // biome-ignore lint/correctness/useHookAtTopLevel: This is fine since isBuilding does not change at runtime
     useHotreload(async (changes) => {
       for await (const change of changes) {
diff --git a/packages/preview-server/src/utils/caniemail/email-clients.ts b/packages/preview-server/src/utils/caniemail/email-clients.ts
new file mode 100644
index 0000000000..43aecaeb29
--- /dev/null
+++ b/packages/preview-server/src/utils/caniemail/email-clients.ts
@@ -0,0 +1,89 @@
+import { env } from '../../app/env';
+
+/**
+ * All supported email clients for compatibility checking.
+ * This is used both as a type and as a runtime validation list.
+ */
+export const allEmailClients = [
+  'gmail',
+  'outlook',
+  'yahoo',
+  'apple-mail',
+  'aol',
+  'thunderbird',
+  'microsoft',
+  'samsung-email',
+  'sfr',
+  'orange',
+  'protonmail',
+  'hey',
+  'mail-ru',
+  'fastmail',
+  'laposte',
+  't-online-de',
+  'free-fr',
+  'gmx',
+  'web-de',
+  'ionos-1and1',
+  'rainloop',
+  'wp-pl',
+] as const;
+
+export const relevantEmailClients = (
+  env.COMPATIBILITY_EMAIL_CLIENTS ?? ''
+).split(',') as EmailClient[];
+
+export type EmailClient = (typeof allEmailClients)[number];
+
+export type Platform =
+  | 'desktop-app'
+  | 'desktop-webmail'
+  | 'mobile-webmail'
+  | 'webmail'
+  | 'ios'
+  | 'android'
+  | 'windows'
+  | 'macos'
+  | 'windows-mail'
+  | 'outlook-com';
+
+export type SupportEntryCategory = 'html' | 'css' | 'image' | 'others';
+
+export interface SupportEntry {
+  slug: string;
+  title: string;
+  description: string | null;
+  url: string;
+  category: SupportEntryCategory;
+  tags: string[];
+  keywords: string | null;
+  last_test_date: string;
+  test_url: string;
+  test_results_url: string | null;
+  stats: Partial<
+    Record<
+      EmailClient,
+      Partial<
+        Record<
+          Platform,
+          /*
+            This last Record<string, string> has only one key, as the
+            ordered version of caniemail's data is meant to be something like:
+
+            [
+              { "1.0": "u" },
+              { "2.0": "y" },
+              { "3.0": "p #1" },
+            ]
+
+            So only one key for each object inside of this array, TypeScript can't really
+            describe this though AFAIK.
+          */
+          Record</* version */ string, string>[]
+        >
+      >
+    >
+  >;
+  notes: string | null;
+  notes_by_num: Record<number, string> | null;
+}
diff --git a/packages/preview-server/src/utils/caniemail/get-compatibility-stats-for-entry.ts b/packages/preview-server/src/utils/caniemail/get-compatibility-stats-for-entry.ts
index e4e6a403b1..251335a300 100644
--- a/packages/preview-server/src/utils/caniemail/get-compatibility-stats-for-entry.ts
+++ b/packages/preview-server/src/utils/caniemail/get-compatibility-stats-for-entry.ts
@@ -1,8 +1,4 @@
-import type {
-  EmailClient,
-  Platform,
-  SupportEntry,
-} from '../../actions/email-validation/check-compatibility';
+import type { EmailClient, Platform, SupportEntry } from './email-clients';
 
 export type SupportStatus = DetailedSupportStatus['status'];
 
diff --git a/packages/preview-server/tsconfig.json b/packages/preview-server/tsconfig.json
index 6eebf9112b..f1cb69a51b 100644
--- a/packages/preview-server/tsconfig.json
+++ b/packages/preview-server/tsconfig.json
@@ -8,7 +8,7 @@
     "forceConsistentCasingInFileNames": true,
     "inlineSources": false,
     "isolatedModules": true,
-    "moduleResolution": "node",
+    "moduleResolution": "bundler",
     "noUnusedLocals": false,
     "noUnusedParameters": false,
     "preserveWatchOutput": true,
@@ -24,14 +24,21 @@
     "declarationMap": false,
     "incremental": false,
     "jsx": "react-jsx",
-    "lib": ["dom", "dom.iterable", "esnext", "ESNext.AsyncIterable"],
+    "lib": [
+      "dom",
+      "dom.iterable",
+      "esnext",
+      "ESNext.AsyncIterable"
+    ],
     "noEmit": true,
     "strict": false,
     "target": "ESNext",
     "module": "esnext",
     "noUncheckedIndexedAccess": true,
     "resolveJsonModule": true,
-    "types": ["vitest/globals"],
+    "types": [
+      "vitest/globals"
+    ],
     "outDir": "dist"
   },
   "include": [
@@ -44,5 +51,10 @@
     ".next/dev/types/**/*.ts",
     "next.config.mjs"
   ],
-  "exclude": [".next", "dist", "emails", "node_modules"]
+  "exclude": [
+    ".next",
+    "dist",
+    "emails",
+    "node_modules"
+  ]
 }
diff --git a/packages/react-email/src/commands/build.ts b/packages/react-email/src/commands/build.ts
index a8ef54c3ec..fa267d2ae2 100644
--- a/packages/react-email/src/commands/build.ts
+++ b/packages/react-email/src/commands/build.ts
@@ -9,15 +9,18 @@ import {
 } from '../utils/get-emails-directory-metadata.js';
 import { getPreviewServerLocation } from '../utils/get-preview-server-location.js';
 import { registerSpinnerAutostopping } from '../utils/register-spinner-autostopping.js';
+import { validateEmailClientList } from '../utils/validate-email-client-list.js';
 
 interface Args {
   dir: string;
   packageManager: PackageManagerName;
+  clients: string;
 }
 
 const setNextEnvironmentVariablesForBuild = async (
   emailsDirRelativePath: string,
   builtPreviewAppPath: string,
+  compatibilityEmailClients: string[],
 ) => {
   const nextConfigContents = `
 import path from 'path';
@@ -31,7 +34,8 @@ const nextConfig = {
     EMAILS_DIR_RELATIVE_PATH: emailsDirRelativePath,
     EMAILS_DIR_ABSOLUTE_PATH: path.resolve(userProjectLocation, emailsDirRelativePath),
     PREVIEW_SERVER_LOCATION: previewServerLocation,
-    USER_PROJECT_LOCATION: userProjectLocation
+    USER_PROJECT_LOCATION: userProjectLocation,
+    COMPATIBILITY_EMAIL_CLIENTS: '${compatibilityEmailClients.join(',')}',
   },
   outputFileTracingRoot: previewServerLocation,
   serverExternalPackages: ['esbuild'],
@@ -160,10 +164,13 @@ const updatePackageJson = async (builtPreviewAppPath: string) => {
 export const build = async ({
   dir: emailsDirRelativePath,
   packageManager,
+  clients,
 }: Args) => {
   try {
     const previewServerLocation = await getPreviewServerLocation();
 
+    const clientsArray = validateEmailClientList(clients);
+
     const spinner = ora({
       text: 'Starting build process...',
       prefixText: '  ',
@@ -216,6 +223,7 @@ export const build = async ({
     await setNextEnvironmentVariablesForBuild(
       emailsDirRelativePath,
       builtPreviewAppPath,
+      clientsArray,
     );
 
     spinner.text = 'Setting server side generation for the email preview pages';
diff --git a/packages/react-email/src/commands/dev.ts b/packages/react-email/src/commands/dev.ts
index dac1a871cb..ab0ced1767 100644
--- a/packages/react-email/src/commands/dev.ts
+++ b/packages/react-email/src/commands/dev.ts
@@ -1,22 +1,31 @@
 import fs from 'node:fs';
 import { setupHotreloading, startDevServer } from '../utils/index.js';
+import { validateEmailClientList } from '../utils/validate-email-client-list.js';
 
 interface Args {
   dir: string;
   port: string;
+  clients: string;
 }
 
-export const dev = async ({ dir: emailsDirRelativePath, port }: Args) => {
+export const dev = async ({
+  dir: emailsDirRelativePath,
+  port,
+  clients,
+}: Args) => {
   try {
     if (!fs.existsSync(emailsDirRelativePath)) {
       console.error(`Missing ${emailsDirRelativePath} folder`);
       process.exit(1);
     }
 
+    const clientsArray = validateEmailClientList(clients);
+
     const devServer = await startDevServer(
       emailsDirRelativePath,
       emailsDirRelativePath, // defaults to ./emails/static for the static files that are served to the preview
       Number.parseInt(port, 10),
+      clientsArray,
     );
 
     await setupHotreloading(devServer, emailsDirRelativePath);
diff --git a/packages/react-email/src/index.ts b/packages/react-email/src/index.ts
index f2151d8a4b..719b05575d 100644
--- a/packages/react-email/src/index.ts
+++ b/packages/react-email/src/index.ts
@@ -20,6 +20,11 @@ program
   .description('Starts the preview email development app')
   .option('-d, --dir <path>', 'Directory with your email templates', './emails')
   .option('-p --port <port>', 'Port to run dev server on', '3000')
+  .option(
+    '-c, --clients <clients>',
+    'Comma-separated list of email clients to show compatibility warnings for (e.g., "outlook,gmail")',
+    'gmail,apple-mail,outlook,yahoo',
+  )
   .action(dev);
 
 program
@@ -31,6 +36,11 @@ program
     'Package name to use on installation on `.react-email`',
     'npm',
   )
+  .option(
+    '-c, --clients <clients>',
+    'Comma-separated list of email clients to show compatibility warnings for (e.g., "outlook,gmail")',
+    'gmail,apple-mail,outlook,yahoo',
+  )
   .action(build);
 
 program
diff --git a/packages/react-email/src/utils/preview/get-env-variables-for-preview-app.ts b/packages/react-email/src/utils/preview/get-env-variables-for-preview-app.ts
index 5d032bff0c..f8a9679db0 100644
--- a/packages/react-email/src/utils/preview/get-env-variables-for-preview-app.ts
+++ b/packages/react-email/src/utils/preview/get-env-variables-for-preview-app.ts
@@ -4,6 +4,7 @@ export const getEnvVariablesForPreviewApp = (
   relativePathToEmailsDirectory: string,
   previewServerLocation: string,
   cwd: string,
+  compatibilityClients: string[],
   resendApiKey?: string,
 ) => {
   return {
@@ -12,5 +13,6 @@ export const getEnvVariablesForPreviewApp = (
     PREVIEW_SERVER_LOCATION: previewServerLocation,
     USER_PROJECT_LOCATION: cwd,
     RESEND_API_KEY: resendApiKey,
+    COMPATIBILITY_EMAIL_CLIENTS: compatibilityClients.join(','),
   } as const;
 };
diff --git a/packages/react-email/src/utils/preview/start-dev-server.ts b/packages/react-email/src/utils/preview/start-dev-server.ts
index 49d4c160ad..805414f9ad 100644
--- a/packages/react-email/src/utils/preview/start-dev-server.ts
+++ b/packages/react-email/src/utils/preview/start-dev-server.ts
@@ -32,6 +32,7 @@ export const startDevServer = async (
   emailsDirRelativePath: string,
   staticBaseDirRelativePath: string,
   port: number,
+  compatibilityClients: string[],
 ): Promise<http.Server> => {
   const [majorNodeVersion] = process.versions.node.split('.');
   if (majorNodeVersion && Number.parseInt(majorNodeVersion, 10) < 20) {
@@ -97,6 +98,7 @@ export const startDevServer = async (
       emailsDirRelativePath,
       staticBaseDirRelativePath,
       nextPortToTry,
+      compatibilityClients,
     );
   }
 
@@ -132,6 +134,7 @@ export const startDevServer = async (
       path.normalize(emailsDirRelativePath),
       previewServerLocation,
       process.cwd(),
+      compatibilityClients,
       conf.get('resendApiKey'),
     ),
   };
@@ -194,21 +197,21 @@ const makeExitHandler =
       | { shouldKillProcess: false }
       | { shouldKillProcess: true; killWithErrorCode: boolean },
   ) =>
-  (codeSignalOrError: number | NodeJS.Signals | Error) => {
-    if (typeof devServer !== 'undefined') {
-      console.log('\nshutting down dev server');
-      devServer.close();
-      devServer = undefined;
-    }
+    (codeSignalOrError: number | NodeJS.Signals | Error) => {
+      if (typeof devServer !== 'undefined') {
+        console.log('\nshutting down dev server');
+        devServer.close();
+        devServer = undefined;
+      }
 
-    if (codeSignalOrError instanceof Error) {
-      console.error(codeSignalOrError);
-    }
+      if (codeSignalOrError instanceof Error) {
+        console.error(codeSignalOrError);
+      }
 
-    if (options?.shouldKillProcess) {
-      process.exit(options.killWithErrorCode ? 1 : 0);
-    }
-  };
+      if (options?.shouldKillProcess) {
+        process.exit(options.killWithErrorCode ? 1 : 0);
+      }
+    };
 
 // do something when app is closing
 process.on('exit', makeExitHandler());
diff --git a/packages/react-email/src/utils/validate-email-client-list.ts b/packages/react-email/src/utils/validate-email-client-list.ts
new file mode 100644
index 0000000000..60c2061043
--- /dev/null
+++ b/packages/react-email/src/utils/validate-email-client-list.ts
@@ -0,0 +1,37 @@
+const validEmailClients = [
+  'gmail',
+  'outlook',
+  'yahoo',
+  'apple-mail',
+  'aol',
+  'thunderbird',
+  'microsoft',
+  'samsung-email',
+  'sfr',
+  'orange',
+  'protonmail',
+  'hey',
+  'mail-ru',
+  'fastmail',
+  'laposte',
+  't-online-de',
+  'free-fr',
+  'gmx',
+  'web-de',
+  'ionos-1and1',
+  'rainloop',
+  'wp-pl',
+] as const;
+
+export function validateEmailClientList(clients: string) {
+  const clientsArray = clients.split(/\s*,\s*/);
+  for (const client of clientsArray) {
+    if (!(validEmailClients as readonly string[]).includes(client)) {
+      console.error(
+        `${client} is not one of the clients we support. Valid options are ${validEmailClients.join(', ')}`,
+      );
+      process.exit(1);
+    }
+  }
+  return clientsArray;
+}
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 2c5eba12b9..4358c04421 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -89,7 +89,7 @@ importers:
     dependencies:
       mintlify:
         specifier: 4.2.258
-        version: 4.2.258(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
+        version: 4.2.258(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
       zod:
         specifier: 3.24.3
         version: 3.24.3
@@ -638,6 +638,9 @@ importers:
 
   packages/preview-server:
     dependencies:
+      '@t3-oss/env-nextjs':
+        specifier: 0.13.10
+        version: 0.13.10(arktype@2.1.27)(typescript@5.8.3)(zod@4.3.5)
       next:
         specifier: 16.1.1
         version: 16.1.1(@babel/core@7.26.10)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)
@@ -832,8 +835,8 @@ importers:
         specifier: 10.0.6
         version: 10.0.6(react@19.0.0)
       zod:
-        specifier: 4.1.12
-        version: 4.1.12
+        specifier: 4.3.5
+        version: 4.3.5
 
   packages/react-email:
     dependencies:
@@ -4392,6 +4395,40 @@ packages:
     resolution: {integrity: sha512-+PmQX0PiAYPMeVYe237LJAYvOMYW1j2rH5YROyS3b4CTVJum34HfRvKvAzozHAQG0TnHNdUfY9nCeUyRAs//cw==}
     engines: {node: '>=14.16'}
 
+  '@t3-oss/env-core@0.13.10':
+    resolution: {integrity: sha512-NNFfdlJ+HmPHkLi2HKy7nwuat9SIYOxei9K10lO2YlcSObDILY7mHZNSHsieIM3A0/5OOzw/P/b+yLvPdaG52g==}
+    peerDependencies:
+      arktype: ^2.1.0
+      typescript: '>=5.0.0'
+      valibot: ^1.0.0-beta.7 || ^1.0.0
+      zod: ^3.24.0 || ^4.0.0
+    peerDependenciesMeta:
+      arktype:
+        optional: true
+      typescript:
+        optional: true
+      valibot:
+        optional: true
+      zod:
+        optional: true
+
+  '@t3-oss/env-nextjs@0.13.10':
+    resolution: {integrity: sha512-JfSA2WXOnvcc/uMdp31paMsfbYhhdvLLRxlwvrnlPE9bwM/n0Z+Qb9xRv48nPpvfMhOrkrTYw1I5Yc06WIKBJQ==}
+    peerDependencies:
+      arktype: ^2.1.0
+      typescript: '>=5.0.0'
+      valibot: ^1.0.0-beta.7 || ^1.0.0
+      zod: ^3.24.0 || ^4.0.0
+    peerDependenciesMeta:
+      arktype:
+        optional: true
+      typescript:
+        optional: true
+      valibot:
+        optional: true
+      zod:
+        optional: true
+
   '@tailwindcss/node@4.1.17':
     resolution: {integrity: sha512-csIkHIgLb3JisEFQ0vxr2Y57GUNYh447C8xzwj89U/8fdW8LhProdxvnVH6U8M2Y73QKiTIH+LWbK3V2BBZsAg==}
 
@@ -9692,8 +9729,8 @@ packages:
   zod@3.24.3:
     resolution: {integrity: sha512-HhY1oqzWCQWuUqvBFnsyrtZRhyPeR7SUGv+C4+MsisMuVfSPx8HpwWqH8tRahSlt6M3PiFAcoeFhZAqIXTxoSg==}
 
-  zod@4.1.12:
-    resolution: {integrity: sha512-JInaHOamG8pt5+Ey8kGmdcAcg3OL9reK8ltczgHTAwNhMys/6ThXHityHxVV2p3fkw/c+MAvBHFVYHFZDmjMCQ==}
+  zod@4.3.5:
+    resolution: {integrity: sha512-k7Nwx6vuWx1IJ9Bjuf4Zt1PEllcwe7cls3VNzm4CQ1/hgtFUK2bRNG3rvnpPUhFjmqJKAKtjV576KnUkHocg/g==}
 
   zustand@4.5.7:
     resolution: {integrity: sha512-CHOUy7mu3lbD6o6LJLfllpjkzhHXSBlX8B9+qPddUsIfeF5S/UZ5q0kmCsnRqT1UHFQZchNFDDzMbQsuesHWlw==}
@@ -11171,36 +11208,6 @@ snapshots:
       - acorn
       - supports-color
 
-  '@mdx-js/mdx@3.1.0(acorn@8.15.0)':
-    dependencies:
-      '@types/estree': 1.0.8
-      '@types/estree-jsx': 1.0.5
-      '@types/hast': 3.0.4
-      '@types/mdx': 2.0.13
-      collapse-white-space: 2.1.0
-      devlop: 1.1.0
-      estree-util-is-identifier-name: 3.0.0
-      estree-util-scope: 1.0.0
-      estree-walker: 3.0.3
-      hast-util-to-jsx-runtime: 2.3.3
-      markdown-extensions: 2.0.0
-      recma-build-jsx: 1.0.0
-      recma-jsx: 1.0.0(acorn@8.15.0)
-      recma-stringify: 1.0.0
-      rehype-recma: 1.0.0
-      remark-mdx: 3.1.0
-      remark-parse: 11.0.0
-      remark-rehype: 11.1.1
-      source-map: 0.7.4
-      unified: 11.0.5
-      unist-util-position-from-estree: 2.0.0
-      unist-util-stringify-position: 4.0.0
-      unist-util-visit: 5.0.0
-      vfile: 6.0.3
-    transitivePeerDependencies:
-      - acorn
-      - supports-color
-
   '@mdx-js/react@3.1.0(@types/react@19.2.7)(react@19.0.0)':
     dependencies:
       '@types/mdx': 2.0.13
@@ -11209,15 +11216,15 @@ snapshots:
 
   '@mediapipe/tasks-vision@0.10.17': {}
 
-  '@mintlify/cli@4.0.862(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)':
+  '@mintlify/cli@4.0.862(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)':
     dependencies:
       '@inquirer/prompts': 7.9.0(@types/node@22.14.1)
       '@mintlify/common': 1.0.651(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/link-rot': 3.0.802(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/link-rot': 3.0.802(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
       '@mintlify/models': 0.0.250
-      '@mintlify/prebuild': 1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/previewing': 4.0.837(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
-      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/prebuild': 1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/previewing': 4.0.837(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
+      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
       adm-zip: 0.5.16
       chalk: 5.2.0
       color: 4.2.3
@@ -11308,12 +11315,12 @@ snapshots:
       - ts-node
       - typescript
 
-  '@mintlify/link-rot@3.0.802(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)':
+  '@mintlify/link-rot@3.0.802(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)':
     dependencies:
       '@mintlify/common': 1.0.651(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/prebuild': 1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/previewing': 4.0.837(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
-      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/prebuild': 1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/previewing': 4.0.837(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
+      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
       fs-extra: 11.1.0
       unist-util-visit: 4.1.2
     transitivePeerDependencies:
@@ -11359,33 +11366,6 @@ snapshots:
       - supports-color
       - typescript
 
-  '@mintlify/mdx@3.0.4(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)':
-    dependencies:
-      '@radix-ui/react-popover': 1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)
-      '@shikijs/transformers': 3.15.0
-      '@shikijs/twoslash': 3.15.0(typescript@5.9.3)
-      arktype: 2.1.27
-      hast-util-to-string: 3.0.1
-      mdast-util-from-markdown: 2.0.2
-      mdast-util-gfm: 3.1.0
-      mdast-util-mdx-jsx: 3.2.0
-      mdast-util-to-hast: 13.2.0
-      next-mdx-remote-client: 1.0.7(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)
-      react: 19.0.0
-      react-dom: 19.0.0(react@19.0.0)
-      rehype-katex: 7.0.1
-      remark-gfm: 4.0.1
-      remark-math: 6.0.0
-      remark-smartypants: 3.0.2
-      shiki: 3.15.0
-      unified: 11.0.5
-      unist-util-visit: 5.0.0
-    transitivePeerDependencies:
-      - '@types/react'
-      - acorn
-      - supports-color
-      - typescript
-
   '@mintlify/models@0.0.250':
     dependencies:
       axios: 1.10.0
@@ -11402,12 +11382,12 @@ snapshots:
       leven: 4.0.0
       yaml: 2.6.1
 
-  '@mintlify/prebuild@1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)':
+  '@mintlify/prebuild@1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)':
     dependencies:
       '@mintlify/common': 1.0.651(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
       '@mintlify/openapi-parser': 0.0.8
       '@mintlify/scraping': 4.0.512(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
       chalk: 5.3.0
       favicons: 7.2.0
       front-matter: 4.0.2
@@ -11433,11 +11413,11 @@ snapshots:
       - typescript
       - utf-8-validate
 
-  '@mintlify/previewing@4.0.837(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)':
+  '@mintlify/previewing@4.0.837(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)':
     dependencies:
       '@mintlify/common': 1.0.651(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/prebuild': 1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/prebuild': 1.0.783(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
+      '@mintlify/validation': 0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
       better-opn: 3.0.2
       chalk: 5.2.0
       chokidar: 3.5.3
@@ -11526,29 +11506,6 @@ snapshots:
       - supports-color
       - typescript
 
-  '@mintlify/validation@0.1.550(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)':
-    dependencies:
-      '@mintlify/mdx': 3.0.4(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)(typescript@5.9.3)
-      '@mintlify/models': 0.0.250
-      arktype: 2.1.27
-      js-yaml: 4.1.0
-      lcm: 0.0.3
-      lodash: 4.17.21
-      object-hash: 3.0.0
-      openapi-types: 12.1.3
-      uuid: 11.1.0
-      zod: 3.21.4
-      zod-to-json-schema: 3.20.4(zod@3.21.4)
-    transitivePeerDependencies:
-      - '@radix-ui/react-popover'
-      - '@types/react'
-      - acorn
-      - debug
-      - react
-      - react-dom
-      - supports-color
-      - typescript
-
   '@monogrid/gainmap-js@3.1.0(three@0.170.0)':
     dependencies:
       promise-worker-transferable: 1.0.4
@@ -13320,6 +13277,20 @@ snapshots:
     dependencies:
       defer-to-connect: 2.0.1
 
+  '@t3-oss/env-core@0.13.10(arktype@2.1.27)(typescript@5.8.3)(zod@4.3.5)':
+    optionalDependencies:
+      arktype: 2.1.27
+      typescript: 5.8.3
+      zod: 4.3.5
+
+  '@t3-oss/env-nextjs@0.13.10(arktype@2.1.27)(typescript@5.8.3)(zod@4.3.5)':
+    dependencies:
+      '@t3-oss/env-core': 0.13.10(arktype@2.1.27)(typescript@5.8.3)(zod@4.3.5)
+    optionalDependencies:
+      arktype: 2.1.27
+      typescript: 5.8.3
+      zod: 4.3.5
+
   '@tailwindcss/node@4.1.17':
     dependencies:
       '@jridgewell/remapping': 2.3.5
@@ -16933,9 +16904,9 @@ snapshots:
       minipass: 3.3.6
       yallist: 4.0.0
 
-  mintlify@4.2.258(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3):
+  mintlify@4.2.258(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3):
     dependencies:
-      '@mintlify/cli': 4.0.862(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
+      '@mintlify/cli': 4.0.862(@radix-ui/react-popover@1.1.15(@types/react-dom@19.0.1)(@types/react@19.2.7)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(@types/node@22.14.1)(@types/react@19.2.7)(acorn@8.11.2)(react-dom@19.0.0(react@19.0.0))(typescript@5.9.3)
     transitivePeerDependencies:
       - '@radix-ui/react-popover'
       - '@types/node'
@@ -17013,22 +16984,6 @@ snapshots:
       - acorn
       - supports-color
 
-  next-mdx-remote-client@1.0.7(@types/react@19.2.7)(acorn@8.15.0)(react-dom@19.0.0(react@19.0.0))(react@19.0.0):
-    dependencies:
-      '@babel/code-frame': 7.27.1
-      '@mdx-js/mdx': 3.1.0(acorn@8.15.0)
-      '@mdx-js/react': 3.1.0(@types/react@19.2.7)(react@19.0.0)
-      react: 19.0.0
-      react-dom: 19.0.0(react@19.0.0)
-      remark-mdx-remove-esm: 1.1.0
-      serialize-error: 12.0.0
-      vfile: 6.0.3
-      vfile-matter: 5.0.0
-    transitivePeerDependencies:
-      - '@types/react'
-      - acorn
-      - supports-color
-
   next-safe-action@8.0.11(next@16.1.1(@babel/core@7.26.10)(react-dom@19.0.0(react@19.0.0))(react@19.0.0))(react-dom@19.0.0(react@19.0.0))(react@19.0.0):
     dependencies:
       next: 16.1.1(@babel/core@7.26.10)(react-dom@19.0.0(react@19.0.0))(react@19.0.0)
@@ -17898,16 +17853,6 @@ snapshots:
     transitivePeerDependencies:
       - acorn
 
-  recma-jsx@1.0.0(acorn@8.15.0):
-    dependencies:
-      acorn-jsx: 5.3.2(acorn@8.15.0)
-      estree-util-to-js: 2.0.0
-      recma-parse: 1.0.0
-      recma-stringify: 1.0.0
-      unified: 11.0.5
-    transitivePeerDependencies:
-      - acorn
-
   recma-parse@1.0.0:
     dependencies:
       '@types/estree': 1.0.8
@@ -19890,7 +19835,7 @@ snapshots:
 
   zod@3.24.3: {}
 
-  zod@4.1.12: {}
+  zod@4.3.5: {}
 
   zustand@4.5.7(@types/react@19.0.1)(immer@9.0.21)(react@19.0.0):
     dependencies: