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 1soft_bounce = yes enabled in my postfix configuration. This worked fine for months. However, I was then “joe jobbed” – which means that some spammer used my domain name as the “from” or “reply to” address on their e-mails. This causes a flood of e-mails from mail servers, which messages such as, no user exists, this account has been deleted, etc. These e-mails are completely valid and authentic responses from e-mail servers. Now – it is my personal opinion that mail servers should reject connections to users who are not real – not generate more messages and bandwidth sending out their rejection response. But I understand why some e-mail….

Categories: Configurations,Email

Tagged: e-mail server, remote server