Send Supabase auth email over SMTP

Point Supabase's custom SMTP at Unitpost so auth emails send from your own verified domain — and skip Supabase's built-in auth-email rate limits.

1. 1

   Open Supabase SMTP settings

   In the Supabase dashboard go to Project Settings → Authentication → SMTP Settings and enable Custom SMTP.

2. 2

   Enter your Unitpost credentials

   Host	smtp.unitpost.com
   Port	587
   Username	unitpost
   Password	Your Unitpost API key
   Sender email	auth@yourdomain.com (verified)
   Sender name	Your app name

   The sender email must be on a domain you've verified in Unitpost, or sends are rejected with a 550.

3. 3

   Save and send a test

   Save the settings, then trigger a magic link or signup confirmation. Supabase renders its own auth templates; Unitpost just delivers them.

4. 4

   Confirm delivery

   The auth email shows up in your Unitpost Activity view with full tracking.