feat: block Gmail/Googlemail email+password sign-up, prompt Google OAuth#343
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When a user enters a gmail.com or googlemail.com email during email+password sign-up, the form now: - Shows an inline info message prompting them to use Continue with Google - Disables the submit button on the client side - Returns a server error if the check is somehow bypassed Co-Authored-By: ben@e2b.dev <ben@e2b.dev>
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ben-fornefeld
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May 25, 2026
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Summary
Prevents users with
@gmail.comor@googlemail.comemails from signing up with email+password. Instead, they see an inline info message prompting them to use "Continue with Google" OAuth.Changes:
src/lib/utils/email.ts— newisGoogleEmail()helper that checks the email domainsrc/app/(auth)/sign-up/page.tsx— client-side: watches the email field in real time; when a Google email is detected, shows an info banner and disables the submit buttonsrc/core/server/actions/auth-actions.ts— server-side: returns a server error early insignUpActionif the email is Gmail/Googlemail (defense in depth)src/configs/user-messages.ts— adds thesignUpGoogleEmailuser-facing messageReview & Testing Checklist for Human
/sign-up, enter a@gmail.comemail → confirm the info message appears and the submit button is disabled@googlemail.comemail → same behavioruser@company.com) → confirm the form works normallyNotes
Sign-in with email+password is intentionally not blocked — this only affects new sign-ups. Existing users who already signed up with a Google email and password can still sign in.
Link to Devin session: https://app.devin.ai/sessions/05eb9cf06f4c4e3f9527f0358675235f