Hello I've been trying to popularize a centralized challenge-response database since last fall. It seems to me that becoming a debian package maintainer for the software to use it would make sense.
Unlike TMDA's distributed profusion of extended addresses, a central RAPNAP (return address, peer network address pair) database only needs to send out a challenge when you change your outgoing SMTP server. In effect, a central server caches challenge responses, so individual challenges are no required all the time. I suppose a RAPNAP patch for Mailman would be a good thing to write... David Nicol
