Windows 2003 server not allowed to relay off Exchnage server.....
Posted on 2009-04-24
We have a W2K3 server @ our hosting site that we want to be able to send emails from via smtp calls. I have set it up as a relay in ESM, so it should be allowed to relay off our exchange server. When I telnet from that server to the exchange server, on port 25, it is able to send fine as long as the RCPT TO: is to an internal user. If I try the same test to an external user, I get:
550 5.7.1 Unable to relay for <external mail address>
BTW, this server is not a in our domain