[plug] good mail server?

[Craig Ringer]

> I rather like sendmail, some people find it hard to pickup but its 
> definately worth it. It might help having webmin installed to help you 
> do some of the common tasks quickly, then you can have a play with its
> more advanced features.

What about security? Sendmail has had a long chain of problems (yes, 
it's widely used, but still....) and I'm concerned about that. On the 
other hand, there's milter and using that MIME-Defang, which I /WANT/. 
So sendmail is a good option at least until things like MIME-Defang are 
available for other MTAs.

That said, I'm more interested in the POP3/IMAP (especially IMAP) server 
side of things. A good IMAP server will be critical here, and so I'd 
love to hear about people's experiences with the various ones out there 
  and their performance (not speed, general quality and utility) in real 
life.

Craig Ringer