Dave Wanta does it again...aspNetMX rules!
Dave Wanta from 123ASPX.com was nice enough to help me out and point me to his aspNetMX component, which validates e-mail address records. I was working on a project wherein I was doing some after-the-fact Spring cleaning, ridding my membership database tables of bad e-mail addresses.
I got a copy of Dave's component (I already own, use, love and swear by his aspNetEmail component for sending out mass e-mails) and I was totally blown away with how easy it was to use and how much functionality was built-in. I actually felt guilty at how little work I needed to do to make a clean sweep of my DB.
It's a great console tool for making sure you deal with bad addresses properly. Get your hands on this one...you won't be disappointed. :)