I've installed UBB on Windows 2000 Adv Sev with IIS. The mail-a-friend works, but e-mail notification of passwords gets the following error messages:

Server Error: "550 5.7.1 Unable to relay for ....
Server Error: "554 5.5.2 No valid recipients"
Server Error: "500 5.3.3 Unrecognized command"

These messages occur for both the email going to the person registering and the email for the moderator.

Any ideas?

Bill