Originally Posted by tijn_tux
Hmm, i have the same problem, added a site for which we dont do the mail,
set it to 'external server' but it still apears in local-host-name
while an other domain has to mail a lot to the above mentioned but this doenst work, postfix tries to deliver the mail locally
Did you set the co-domain to external mailserver too? You will have to set it at lesat in 2 places to external mailserver!