I just set up an email on a server I haven't used for email yet...that I plan on starting to use. Its an ensim/linux box (Linux domain 2.6.9-67.EL #1 Wed Nov 7 13:41:13 EST 2007 i686 i686 i386 GNU/Linux)

When I send an email through pop3 the email address (email@domain.com) comes through as email@domain.com.serverdomain.com

When I setup a forwarder in an alias, a line in maillog shows:
Mar 5 13:35:18 secure2 sendmail[19548]: m25JZGiL019548: to=email@offserveraddress.com, ctladdr=<apache@serverdomain.com> (48/48), delay=00:00:02, xdelay=00:00:00, mailer=esmtp, pri=61471, relay=offserveraddress.com.serverdomain.com. [ip address of server], dsn=2.0.0, stat=Sent (m25JXgEh029439 Message accepted for delivery)

So its relaying to offserveraddress.com.serverdomain.com, so obviously, the email isn't going to offserveraddress.com, but to serverdomain.com

Anyone have any idea what is causing this and how to fix it?

On edit, this might be from the domain Im trying to forward it to, since it works for gmail domains and others. Im still not sure why the email address Im sending through is being treated as a subdomain though.