I've had a tab opened for quite a long time that opens Infrastructure.org. Their page about setting up mail has something that needs to be adapted to XMPP/Jabber. Here's the adaptation:

Avoid like the plague any attempts to use non-XMPP messaging solutions -- the world has gone XMPP, and there are now many fine GUI XMPP messengers available along with many libraries to create automated agents. Proprietary solutions are no longer necessary for user-friendliness or for your messaging infrastructure.

That was adapted from http://www.infrastructures.org/bootstrap/mail.shtml.