Main focus on the MTA should be
- general security of the MTA
- performance and stability
- pop before smtp support (probably through other software, etc)
- smtp authentification support
- ssl support
- virtual domain support
The volume is about 3000 messages / day [~ 1 GB / day].
Which MTA would be the best one in that case from your personal experience(OS is Debian 3.0) ?
Documents about the implementation of SMTP AUTH, POP-BEFORE-SMTP available ? If so, maybe some URLs ...
Postfix itself looks like a nice product, but so does Exim, so if anybody has experience with both of them please be so kind and post your comments :-)