Relaying Problems

[Statistik]

I have a working kolab2.1 beta4 setup with 3 domains, and all is working fine, until i realised that mail in between the local domains are rejected

Remote MTA mail1.domain.ltd: SMTP diagnostic: 554 <andre at domain.ltd>: Sender address rejected: Invalid sender.

This when I try to send from domainX->domainY using an unauthenticated smtp relay.

But as far I get the setup unauthenticated relays should be allowed

Cheer André