Category Archives: Postfix

Email server problem – caused bounces

A problem developed on the email server today that caused it to bounce some email. The problem was that the internal email delivery agent for email destined to our server stopped doing DNS lookups properly and so could not resolve … Continue reading

Posted in Email, Postfix

Preventing SMTP Auth abuse

One of the biggest problems I have had to deal with over the past few years has been abuse of authenticated SMTP. Spammers occasionally manage to obtain a customer’s username and password and use these to send email via our … Continue reading

Posted in Code, Email, Perl, Postfix, SPAM