We have our OTRS server on our internal LAN, which is behind a router running NAT. The actual mail server is outside the LAN, and we POP and SMTP mail from there. The actual FQDN is company.com, and the OTRS server is called chuckles, but the DNS is NOT exported beyond the router. I have tried chuckles.company.com, but of course there is no chuckles.company.com on the internet, nor does user@chuckles.company.com actually return mail to the correct user. I have tried chuckles.localdomain, but then I (and other AGENTS) get new ticket notification mail with the return address of otrs@chuckles.localdomain. The actual POP3 email address is helpdesk@company.com (which resides on our external mail-server) so our normal return mail (notifying the CUSTOMER of their assigned, for instance) work properly. Can someone take all of this, and tell me which FQDN I should put in Config.pm. Thanks, Steve