-i hope these are still being read-
First of all, Thanks for a great article Duncan. I couldn't do sendmail w/o something like this. Amazon.com has my Hacks book on the way. Hopefully you get a cut for your contributions. :)
It would be really nice to be able to setup SSL for outgoing mail. That way we could loosen up the RELAY configs so we could email out securely from anywhere. Will we see this in our future?