ispconfig local-host-name problems

I have a client whos domain name keeps getting generated into this file. Noone from my server can them email them and I can't seem to figure out why this is happening. The domain is set to external mailserver ... although originally they were setup as an internal mailserver. Please HELP!

Thanks!

 

Figured it out! I had to go under co-domains and edit it to be external mailserver. Thanks Guys!