> > Does anyone know of a POP3 server that can use a Postgresql DB to
> > authenticate usernames & passwords ?
vpopmail has support for it. Combine it with qmail, and you've got a
very serious mail server. vpopmail has a bunch of other nifty features
that make it very desirable as a pop3 server, as well.
http://www.inter7.com/vpopmail/features.html
steve