Thanks Dave
I just wanted to publically thank Dave Wanta for letting me know that one of my systems here in my office had been blacklisted about 3 years ago. He found the problem because an email I sent him earlier today was listed as SPAM. I thought I had taken care of the problem a while back, but obviously not. I've requested a check, so hopefully, the system will be removed from the blacklist relatively soon.
Wally