I've been running my own mail server for I guess about a year now I think. I learned a lot going through and setting it all up and configure everything to ensure mail gets delivered and rejecting obvious spam and it's been working pretty well. I just had a small batch of spam make it through, and one thing I don't understand is how an email gets delivered to an email address that isn't in the To field. Strange. These headers for these emails are CRAZY long.