Information Systems & Services (ISS)
Spam - Changes to mail architecture
Pre February 2004
In the scenario above mail arrived at the DCU mail server via two routes
- directly from external sources
- through one of our external mx backups
February 2004 - June 2005
In the scenario above we added a number of new layers to mail processing
- Mail Gateway
We have put in place 2 mail gateways which process all mail destined for the DCU mail server. This allows us to weed out spam before it gets to the mail server.
- MX Backups
We moved away from dependency on MX Backups.
Our postfix config is based on Jim Seymour's anti-UCE cheat sheet.
This is a high performance interface between the MTA (postfix) and virus/spam scanning.
- Anti Virus
Reject any mails containing a virus (using ClamAV).
This program catches mail which it suspects to be spam.