Thank Till! I'm sure I'm missing something easy...
If I do not specify the host or domain names, I think Postfix simply assigns the fully-qualified domain name from gethostname() to $myhostname and $mydomain is the same but leaving off the first component. Regardless, I've tried it both ways to same effect.
I think gethostname() uses what's in /etc/hostname and I've changed and tested this by typing hostname at the command line and it all gives the expected results.
The actual machine name is different than any in the ISPConfig UI and the domain name is also unique. However, in the ISPConfig server setup screen, I do name the actual server. There are no virtual servers with this name and I do not see this in the database, as I would expect.
The maillog also doesn't show anything to help and nor does system messages.
It seems the name may be cached somewhere or something from all my testing?
Last edited by cartdev; 3rd March 2006 at 23:39.