Mail recommendation

[Richard Pyne]

I am looking for feedback and suggestions. I am setting up a new mail 
server using lunar. The things I know I want to do/use are:

Postfix
courier-imap (I think)
Virtual domains/mailboxes with separate userspace for each domain.
pop-before-smtp (functionality)
web based mail reader
mailman
spam/virus filtering
Postgres for mail user management

I welcome any suggestions as to which modules to use and configuration 
hints and suggestions.
-- 
Richard B. Pyne
rpyne at kinfolk.org