Thanks for pointing me towards the external domain. I selected external mail server for
domain.com (which is using gmail), and left internal mail server for
The users at store.domain.com have .forward files to forward to email@example.com
However the entries for firstname.lastname@example.org
are still in /etc/postfix/local-host-names and /etc/postfix/virtualusertable even after restarting ISPConfig. Shouldn't they be removed?