Multiple Domain Mail Issue

[AutootuA]

I have two domains set up. The default domain works just like it should. The second domain will not send mail to external addresses. It will only send to internal addresses on the two domains. It will accept all mail, internal and external. Any clues???

[mmorse]

Hm, start with some zmprov gd domain.com & zmprov ga user@domain.com's and see if there's any major differences like zimbraMailTransport values that are different or something.