I am trying to replace a 5.5 server with 2003 and in the migration will need to temporarily setup another 5.5 exchange server. The campus people will not allow any more outbound port 25 traffic. So Im trying to use one of the campus servers as a smart relay system. The setup is as follows: Connections/Internet mail service/address space/ e-domain = * cost = 1 restrictions = organization routing address = campus.mail.edu The mail gets bounced back from the smart relay system and looks like this. I would think the address should look something like user@comcast.net@campus.mail.edu The original message was received at Fri, 20 Apr 2007 10:25:49 -0400 (EDT) from nospam.mail.edu [xxx.xxx.xxx.xx] ----- The following addresses had permanent fatal errors ----- <IMCEASMTP-user+40comcast+2Enet@campus.mail.edu> (reason: 501 Bad address syntax) ----- Transcript of session follows ----- ... while talking to nospam.mail.edu.: >>> DATA <<< 501 Bad address syntax 554 5.0.0 Service unavailable <<< 503 Bad sequence of commands Thanks for any help Marc