Originally Posted by till
To trak this down:
1) If you send an email to this domain, wich lines appear in the mail log?
2) Is the domain listed in the file /etc/postfix/local-host-names ?
3) Is the email address that shall receive the emails listed in /etc/postfix/virtusertable ?
4) Which output do you get when you exectute
dig MX mydomain.com
Replace mydomain with your domainname
Thanks so much for your suggestions you got me on the right track, and yes it was simple after all... turns out I somehow changed the Co-domain hostname for that particular domain to include www, which rendered the email useless.