To follow up to my own posting:
at <http://postmaster.cryp.to/> you will find the first beta release of Postmaster, a mail transport agent written in Haskell.
If anyone feels like being an "early adopter", I've just made a release of the software available for download. So you don't need Darcs anymore. There is also a tutorial to get you started on how to configure the MTA, although it's not yet complete (and won't be for a couple of days at least). The usual early adopter problems ... I'd be particularly interested in feedback from the Windows fraction of the list. Right now, the daemon will almost certainly not work under Windows. I would like it to, though, so I figured the sooner I port it, the better. Without access to a Windows machine and zero knowledge about the OS, though, that's difficult without help. What else? If you'd like to talk to the daemon, feel free to telnet peti.cryp.to smtp and see what happens. Be careful not to produce too many 5xx replies, though. There is dynamic blacklisting code in place. :-) Have fun. Peter