I have an old server thats hosting mail for myself and a friend. Currently its a Gentoo based Postfix+Spamassasin+Clamav+Procmail+courier setup. The general setup is that mail gets delivered from ...

Have you tried checking to see if postfix was built with SASL support? postfix -A I believe. According to the readme that comes with the source RPM, you need to do all this explicitly to enable SASL ...