I've bot a bug on my linux. When i try to send an email to my local mail server using is normal address (XXX@mydomain.com) it doesnt work because the @mydomain.com refer to my domain controller becasue he's inside my local network. Is it possible via webmin to setup a translation to say: When your trying to send an email to @mydomain.com use @mail.mydomain.com ?? This will probably fix my problem.

Note: all other mail like hotmail, etc work (because they'r outside my local network).