postfix mail domains

[sseitz]

Due to customer needs, I've found one strange behaviour of ispcp (compared to other control panels).
If e.g. a customer holds two domains, both with regular webspace and mysql, but only one of them with email adresses and postboxes, the other one with MX delegated to a thirdparty mail appliance, he will be unable to mail from one of his regular email adresses to his mail accounts handled by thirdparty.

It looks like the postfix configuration /etc/postfix/ispcp/domains (and subsequent also domains.db) holds every domain, regardless if this domain holds addresses (reflected in aliases/aliases.db and mailboxes/mailboxes.db)
I suggest that a domain should only be added to domains/domains.db if there is an address assigned. If the last address of a domain has been removed, the domain should get removed for mail purposes at all.

As I'm going to do the needed work for this (well, by now learning and understanding the ispcp way of configuration) I'ld really like to see pro's and con's.

Cheers,
Stephan