bug fixed

reject_unverified_recipient returns wrong code

admin · 2026-04-15 16:30

Postfix is returning 450 (temporary defer) for unknown recipients instead of 550 (permanent reject). Sender's server keeps retrying for days.

Comments (1)

adminadmin 2026-04-15 18:00

Set unverified_recipient_reject_code=550 in main.cf. Default is 450 which doesn't help us.