diff --git a/.github/workflows/verify.yml b/.github/workflows/verify.yml
index 6f622bc..26e3440 100644
--- a/.github/workflows/verify.yml
+++ b/.github/workflows/verify.yml
@@ -2,6 +2,7 @@ name: Verify
 on:
   pull_request:
   push:
+    branches: [main]
 permissions:
   contents: read
 concurrency:
@@ -19,6 +20,7 @@ jobs:
           cache: npm
       - run: npm ci
       - run: npm run lint
+      - run: npx oxfmt --check
       - run: npm run typecheck
       - run: npm test
       - run: npm run build
diff --git a/README.md b/README.md
index 303b511..1fba937 100644
--- a/README.md
+++ b/README.md
@@ -44,25 +44,25 @@ The homepage renders without Supabase. The inquiry form and the admin need it.
 | `OWNER_EMAIL`                                           | script | setup only | Only `scripts/provision-owner.mjs` reads it.                                                    |
 | `E2E_OWNER_EMAIL`, `E2E_OWNER_PASSWORD`, `E2E_BASE_URL` | test   | e2e only   | Only Playwright reads them. The base URL defaults to `http://localhost:3000`.                   |
 
-On Vercel, the API also accepts the origins in `VERCEL_URL` and `VERCEL_PROJECT_PRODUCTION_URL`, and reads the client IP from `x-vercel-forwarded-for`. Outside Vercel, every request counts against the same rate limit.
+On Vercel, the API also accepts the origins in `VERCEL_URL`, `VERCEL_BRANCH_URL` and `VERCEL_PROJECT_PRODUCTION_URL`, and reads the client IP from `x-vercel-forwarded-for`. Outside Vercel, every request counts against the same rate limit.
 
 Give each environment its own database and secrets. Never add the `NEXT_PUBLIC_` prefix to a server secret.
 
 ## Commands
 
-| Command             | What it does                                                                              |
-| ------------------- | ----------------------------------------------------------------------------------------- |
-| `npm run dev`       | Starts the dev server.                                                                    |
-| `npm run lint`      | Runs oxlint with type-aware rules.                                                        |
-| `npm run format`    | Formats with oxfmt.                                                                       |
-| `npm run typecheck` | Generates route types, then runs `tsc --noEmit`.                                          |
-| `npm test`          | Runs validation and Slack tests, and runs the real migrations and RLS policies in PGlite. |
-| `npm run test:e2e`  | Runs Playwright against a running app and a real Supabase project.                        |
-| `npm run test:public` | Runs public UI regressions against a production build without Supabase credentials. |
-| `npm run test:session` | Checks login outage recovery and unauthorized denial against a local mock service. |
-| `npm run build`     | Builds for production.                                                                    |
-
-CI (`.github/workflows/verify.yml`) runs lint, typecheck, tests, build, `npm audit` across production and development dependencies at every severity, public UI browser regressions, and local session-recovery checks on every push and pull request. CI does not run the authenticated provider e2e tests.
+| Command                | What it does                                                                              |
+| ---------------------- | ----------------------------------------------------------------------------------------- |
+| `npm run dev`          | Starts the dev server.                                                                    |
+| `npm run lint`         | Runs oxlint with type-aware rules.                                                        |
+| `npm run format`       | Formats with oxfmt.                                                                       |
+| `npm run typecheck`    | Generates route types, then runs `tsc --noEmit`.                                          |
+| `npm test`             | Runs validation and Slack tests, and runs the real migrations and RLS policies in PGlite. |
+| `npm run test:e2e`     | Runs Playwright against a running app and a real Supabase project.                        |
+| `npm run test:public`  | Runs public UI regressions against a production build without Supabase credentials.       |
+| `npm run test:session` | Checks login outage recovery and unauthorized denial against a local mock service.        |
+| `npm run build`        | Builds for production.                                                                    |
+
+CI (`.github/workflows/verify.yml`) runs lint, a formatting check, typecheck, tests, build, `npm audit` across production and development dependencies at every severity, public UI browser regressions, and local session-recovery checks on every pull request and every push to `main`. CI does not run the authenticated provider e2e tests.
 
 To run public UI regressions locally, run `npm run build`, `npx playwright install chromium`, and `npm run test:public`. The tests start their own production server on port 3012.
 
diff --git a/components/inquiry-form.tsx b/components/inquiry-form.tsx
index ee74cb6..566e0fa 100644
--- a/components/inquiry-form.tsx
+++ b/components/inquiry-form.tsx
@@ -121,7 +121,13 @@ function ProjectRange({
   );
 }
 
-export function InquiryForm({ caseStudy }: { caseStudy?: Study }) {
+export function InquiryForm({
+  caseStudy,
+  onSent,
+}: {
+  caseStudy?: Study;
+  onSent?: () => void;
+}) {
   const id = useId();
   const submissionId = useRef<string | null>(null);
   const [result, setResult] = useState<Result>({ kind: 'idle' });
@@ -171,6 +177,7 @@ export function InquiryForm({ caseStudy }: { caseStudy?: Study }) {
       ) {
         setResult({ kind: 'success', reference: body.reference });
         submissionId.current = null;
+        onSent?.();
       } else {
         const message =
           typeof body === 'object' &&
@@ -371,6 +378,9 @@ export function InquiryButton({
   const dialog = useRef<HTMLDialogElement>(null);
   const [portalTarget, setPortalTarget] = useState<HTMLElement | null>(null);
   const id = useId();
+  // The dialog stays mounted to keep a draft; a sent request gets a fresh form next time.
+  const [sent, setSent] = useState(false);
+  const [formKey, setFormKey] = useState(0);
   useEffect(() => {
     if (!open) return;
     dialog.current?.showModal();
@@ -392,7 +402,13 @@ export function InquiryButton({
             ref={dialog}
             className="inquiry-dialog"
             aria-labelledby={id}
-            onClose={() => setOpen(false)}
+            onClose={() => {
+              setOpen(false);
+              if (sent) {
+                setSent(false);
+                setFormKey((key) => key + 1);
+              }
+            }}
           >
             <button
               className="inquiry-close"
@@ -402,7 +418,7 @@ export function InquiryButton({
               ×
             </button>
             <h2 id={id}>Let&apos;s talk about your idea.</h2>
-            <InquiryForm />
+            <InquiryForm key={formKey} onSent={() => setSent(true)} />
           </dialog>,
           portalTarget,
         )}
diff --git a/lib/crm/origin.ts b/lib/crm/origin.ts
index 7d9d516..6d3e0b6 100644
--- a/lib/crm/origin.ts
+++ b/lib/crm/origin.ts
@@ -5,6 +5,8 @@ export function isAllowedOrigin(request: Request) {
   if (process.env.VERCEL) {
     for (const host of [
       process.env.VERCEL_URL,
+      // Preview links usually open the branch alias, not the per-deployment URL.
+      process.env.VERCEL_BRANCH_URL,
       process.env.VERCEL_PROJECT_PRODUCTION_URL,
     ]) {
       if (host) allowed.push(`https://${host}`);
diff --git a/tests/database.test.ts b/tests/database.test.ts
index 73a19cd..f12124c 100644
--- a/tests/database.test.ts
+++ b/tests/database.test.ts
@@ -354,9 +354,7 @@ test('intake reports whether a submission is new or a retry', async () => {
 
 test('admin_users holds exactly one owner', async () => {
   await assert.rejects(
-    db.query('insert into public.admin_users(user_id) values ($1)', [
-      stranger,
-    ]),
+    db.query('insert into public.admin_users(user_id) values ($1)', [stranger]),
     /duplicate key/,
   );
   const owners = await db.query<{ user_id: string }>(
diff --git a/tests/e2e/public-ui.spec.ts b/tests/e2e/public-ui.spec.ts
index cc08756..637544e 100644
--- a/tests/e2e/public-ui.spec.ts
+++ b/tests/e2e/public-ui.spec.ts
@@ -94,3 +94,41 @@ test('mobile request survives desktop resize without leaving the page locked', a
     .click();
   await expect(page.locator('body')).not.toHaveCSS('overflow', 'hidden');
 });
+
+test('a sent request leaves a fresh form for the next one', async ({
+  page,
+}) => {
+  await page.route('**/api/requests', (route) =>
+    route.fulfill({
+      status: 201,
+      json: { ok: true, reference: '11111111-1111-4111-8111-111111111111' },
+    }),
+  );
+  await page.goto('/');
+  const start = page
+    .getByRole('button', { name: 'Start your project', exact: false })
+    .first();
+  await start.click();
+  const dialog = page.getByRole('dialog');
+  const name = dialog.getByRole('textbox', {
+    name: 'Your name *',
+    exact: true,
+  });
+  await name.fill('Fresh form check');
+  await dialog
+    .getByRole('textbox', { name: 'Email address *', exact: true })
+    .fill('fresh@example.com');
+  await dialog
+    .getByRole('textbox', { name: 'What would you like to build? *' })
+    .fill('A fictional project used only by the UI regression test.');
+  await dialog.getByRole('checkbox', { name: /I agree/ }).check();
+  await dialog.getByRole('button', { name: /Send project request/ }).click();
+  await expect(dialog.getByText('Request received.')).toBeVisible();
+  await dialog
+    .getByRole('button', { name: 'Close request', exact: true })
+    .click();
+  await expect(dialog).not.toBeVisible();
+  await start.click();
+  await expect(name).toBeVisible();
+  await expect(name).toHaveValue('');
+});
diff --git a/tests/origin.test.ts b/tests/origin.test.ts
new file mode 100644
index 0000000..113f13d
--- /dev/null
+++ b/tests/origin.test.ts
@@ -0,0 +1,53 @@
+import assert from 'node:assert/strict';
+import { afterEach, beforeEach, test } from 'node:test';
+import { isAllowedOrigin } from '../lib/crm/origin';
+
+const keys = [
+  'APP_URL',
+  'DEPLOYMENT_ORIGIN',
+  'VERCEL',
+  'VERCEL_URL',
+  'VERCEL_BRANCH_URL',
+  'VERCEL_PROJECT_PRODUCTION_URL',
+] as const;
+let saved: Record<string, string | undefined>;
+
+beforeEach(() => {
+  saved = Object.fromEntries(keys.map((key) => [key, process.env[key]]));
+  for (const key of keys) delete process.env[key];
+});
+afterEach(() => {
+  for (const key of keys) {
+    if (saved[key] === undefined) delete process.env[key];
+    else process.env[key] = saved[key];
+  }
+});
+
+const from = (origin?: string) =>
+  new Request('https://example.test/api/requests', {
+    method: 'POST',
+    headers: origin ? { origin } : {},
+  });
+
+test('Vercel deployments accept their deployment, branch and production origins', () => {
+  process.env.APP_URL = 'https://jonasinfocus.com';
+  process.env.VERCEL = '1';
+  process.env.VERCEL_URL = 'site-abc123.vercel.app';
+  process.env.VERCEL_BRANCH_URL = 'site-git-feature.vercel.app';
+  process.env.VERCEL_PROJECT_PRODUCTION_URL = 'site.vercel.app';
+  for (const origin of [
+    'https://jonasinfocus.com',
+    'https://site-abc123.vercel.app',
+    'https://site-git-feature.vercel.app',
+    'https://site.vercel.app',
+  ])
+    assert.equal(isAllowedOrigin(from(origin)), true, origin);
+  assert.equal(isAllowedOrigin(from('https://evil.example')), false);
+  assert.equal(isAllowedOrigin(from('http://site.vercel.app')), false);
+});
+
+test('requests without an origin or from an unlisted origin are rejected', () => {
+  process.env.APP_URL = 'https://jonasinfocus.com';
+  assert.equal(isAllowedOrigin(from()), false);
+  assert.equal(isAllowedOrigin(from('https://site-abc123.vercel.app')), false);
+});