Client behind a router results is rejected email

[markcasazza]

I am running RedHat 9. I recently moved my windows workstations to their own subnet behind a Netgear router. The server is located in the 192.168.0.0/24 network. The Workstations are located on 192.18.1.0/24. When the workstations were located on the same LAN as the mail server no problem existed. Since I have moved them some recipients will not accept my emails. The error message that I get is: "The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was 'username@epix.net'. Subject 'test', Account: 'Username@Casazza.net', Server: '

http://www',

Protocol: SMTP, Server Response: '550 5.7.1 <username@epix.net>... Relaying denied', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79"

If I connect the workstation back on the same LAN as the mail server it works again. What I find odd is I can send mail to the same recipient via a mail server at hotpop.com.

TIA,

Mark C