Daniel,
> 5F47320CEC2 4338844 Mon Dec 28 13:12:09 idiotu...@amfes.com > (host mail.fireprobymesa.com[65.40.152.138] said: 550 5.1.1 User unknown > (in reply to RCPT TO command)) > jeff...@fireprobymesa.com Do you have "soft_bounce=yes" configured? (http://www.postfix.org/postconf.5.html#soft_bounce) That seems to be the reason why postfix isn't immediately bouncing the message to the sender. If you don't have a good reason to keep soft_bounce activated (and you shouldn't on a production machine), try if disabling solves your problem. -hannes
