Supabase
Supabase Auth
One uniform auth config, Reconciled to every Site’s Supabase project with read-back.
cogs-supabase-sync pushes SMTP, captcha, rate-limit and redirect settings through the Supabase Management API, verifies them by reading back and rolls back on a mismatch.
The Send service’s Before-User-Created hook rejects sign-ups from disposable email domains.