E-mail Server

[Gordon Messmer]

There's plenty of advocacy for Postfix and Dovecot on this list; I 
occasionally like to chime in with a bit for Courier MTA:
http://www.courier-mta.org/

Among the advantages I appreciate:
* Maildrop is much easier to manage than procmail
* Configuration is much simpler: it's substantially similar to the 
highly regarded Qmail
* The entire system is a single integrated package, so you only have to 
configure things like authentication once rather than for each server 
(as in postfix and dovecot).
* Courier supports an SMTP filtering API that's much simpler than either 
Postfix or Sendmail.  I wrote courier-pythonfilter to help email admins 
filter and modify messages using Python. ;)