Given the proliferation of spam on just about every vaguely workable platform these days it seems sheer insanity to attempt to run your own mail server. If it's out there, it's ripe for abuse in one way in another. And yet, e-mail is still probably one of the best ways to get status reports from your machines every day (my SMTP bridge notwithstanding). It is thus that the default configuration for mail servers these days defaults to "no way in hell will I relay a message for you," which is a net good for the the Internet as a whole …
It's the holidays. I'm pretty busy right now, and hoping I don't have a sinus infection. I haven't forgotten about anybody. I'll get to the time-sensitive stuff first, and rest as I can.
To everyone waiting on e-mail replies from me, please be patient. I'm catching up at work and trying to allocate my spoons appropriately. I'll get back to you, promise.