Good morning. I am having a problem sending external mail, I can receive email to domain.abc no problem, however when I try to send an external mail I receive the following message: The following organization rejected your message: globalex01.internal.local, globalex01 is our mailbox server, cas server and hub transport server. I also get the message 5.7.1 unable to relay. We are using message labs and our server has been natted out and sits behind a firewall.
I've checked the default receive connector and the permission groups are set to anonymous users, exchange users, exchange servers, legacy exchange servers. The Send connector seems to be setup correctly too.
Any help would be great.
Many thanks, Dylan.