Delivery Temporarily Suspended Unknown Mail Transport Error Postfix Upd ★

(Warning: This deletes ALL deferred mail. Use postqueue -p first to inspect.)

By methodically isolating the transport—whether Dovecot, Amavis, Maildrop, or a custom script—you can convert the "unknown" into a known, actionable fix. And once resolved, safeguard your configuration to ensure that the next system update doesn’t leave your mail queue suspended once again. (Warning: This deletes ALL deferred mail