Thanks for the heads-up. I had no problem getting Sendmail to work on my old host prior to installing MT-Blacklist, so this was a complete surprise.
Just checked, and sure enough, I had installed it, but hadn't re-activated it nor installed the latest blacklist.txt file.
Thanks again :o)
Update: Turns out I spoke to soon. Reactivating MT-BLacklist and installing the latest list didn't work. Sooooo, I went back into my Weblog Configuration and sure enough . . . dumb me missed checking the send email with new comments . . . sheesh ~smacks self in the head~