Pure-perl SMTP server
I've been reading the docs and code. So simple and small! By itself it is totally non-functional. All it does by itself is speak proper SMTP, and plugins do the rest.
There are plugins for delivery, DNSRBL, SpamAssassin, you name it.
I can see myself really getting into this.
I fucking hate the ugly mess my personal/family mail system has turned into (mostly because it hardly works) and LiveJournal's mail system is far from ideal.