I've configured Zimbra for domain.com on the NAT'ed internal server as described in:
Split Domain - Zimbra :: Wiki
So... now absolutely all mail for non-local recipients goes to external relayhost. And it's pretty good with one important exception: I have an internal domain, which must be accessed directly (not within the relayhost).
How to add such "direct" transport for internal domain (with MX and A-records properly configured) named lists.domain.com and hosted on lists.domain.com server?
P.S. I need something like lists.domain.com=smtp:[lists.domain.com]:25 or lists.domain.com=smtp:lists.domain.com, but where and how to add it? And this transport must have highest priority.