Cookbook
Integrations
Stable
Outbound Email Safelist — Stop Test Emails Reaching Real People
An Action Mailer interceptor that reroutes every outbound email to a safelist while the app is in testing, so a stray notification can never reach a real customer or supplier. Covers the reroute-don't-drop rule, the EMAIL_SAFELIST env switch, and how to remove it safely on go-live.
Related
Cookbook
Twilio — SMS Sending & Phone Verification
Sibling recipe for the other outbound channel — same .env-key + container-recreate pattern, and it needs the same "don't text real people during testing" guard.
Link
Action Mailer interceptors — Rails Guides
Official reference for the delivering_email hook this recipe uses.