Receiving email via Postfix and qmail has previously been described on this forum ( <a href="http://news.ycombinator.com/item?id=186879" rel="nofollow">http://news.ycombinator.com/item?id=186879</a> ). To send email, pipe data to /usr/lib/sendmail or suchlike. Postfix, qmail and other MTAs typically install a wrapper at /usr/lib/sendmail<p>However, if you're hosting on ADSL, the IP address of your mail server is probably blacklisted, so you may have to configure your MTA to forward messages to your ISP's MTA. I found this easiest to configure in Sendmail, which can be configured to co-exist with other MTAs.