When attempting to send mail from outside to an email adderss, I get the above error code. The email address is set in the SMTP (not main address but a sub-address w/i Exchange). I did not set this up but attempting to see what I can do. I think it is w/i the virtual server. Any Help Much Appreciated Garry

You probley probley lies in how you have your smtp vserver configured, you using this I presume to send mail? What does your SMTP log say?