I see that the /etc/postfix/virtusertable has entries such as:
As many of the users on this ISPConfig system do not host their mail on the same server as their web, there is no need for this entry. I also believe this is what is screwing RoundCube up because it seems to be picking the first entry in the virtusertable for any given user and that first entry always has the 'www' part in it.
How do I stop ISPConfig from writing the www version of the address to the /etc/postfix/virtusertable file?
The mailing list from RouncCube evidently has no idea. I've had no response at all to my question and my most recent prompt has now been returned from their mailing list with a 'recipient address rejected' error.