Okay, just made SOME progress.
It turns out that the Domain changes that I made to the MX lists using the Plesk Control Panel, DIDN'T really propagate to the server settings!!! I discovered that last night after I tried for three days to get it to send mail.
So, once I found that, I modified the settings using the Server Admin account (yes, this is Webintellects) and then it started sending me emails from the the webmaster account.
So, I'm almost there. Just killed the SMTP setting in the UBB CP, that I added earlier this week. We'll see if that opens up the rest of the emails that the Forum needs to send.
