Wari is connecting Hep to his fetchmail/procmail/postfix setup, and documenting it all on his site:
Some Tips and Tricks for using Hep with Postfix
How to use Hep to deliver messages to your weblog, while still using Postfix to deliver e-mail.
How to use procmail, fetchmail, and Hep to monitor a mailbox and post any messages sent there to a weblog.