SMTP Errors – 550 vs 450

Well I got a lesson in properly configuring your e-mail server’s error messages. Since setting up postfix as a anti-spam and anti-virus gateway for my exchange system (see my article Postfix as proxy to exchange server), I had left the option soft_bounce = yes enabled in my postfix configuration. This worked fine for months. However, … Continue reading SMTP Errors – 550 vs 450