We have an exchange 2003 server at a clients location behind a firewall.
SMTP, POP3, and IMAP ports are forward through firewall.
When the user from home tries to send an email through the server to an outside address we get
The message could nt be sent because one of the recipients was rejected by the server. The rejected e-mail addess was "outside address". Subjet 'test' Account: 'gary'. Server: "exhchange FQDN", Protocol: SMTP< Server response: "550 5.7.1 Unable to relay for "outside address", Port:25, Secure(SLL): No, Server Error; 550, Error number: 0x800CC79
If I allow relaying through the server for any computer this work, but I cannot have an open relay. I have "Allow all computers which successfully authenticate to relay" checked.
Anonymous, Basic and Integrated Auth. is checked for Authentication.