Lots of good recommendations here. Slightly off-topic, but maybe someone can help me relay around a residential Comcast block? I've asked this question before - but didn't get (or understand) what I need to do. I know I need to switch from port 25 to port 587 and this may involve some cryptography. If anyone actually has this working with Postfix or sendmail, I would be interested in duplicating your solution. I don't need anything fancy - just want to run some Mailman lists out of my basement.