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It seems that the remote site refuses to accept your mail.
Perhaps your domain is not setup correctly (can you resolve your domain from the outside world)?
Hi Andreas, I`ve checked my domain and is working from outside.
The problem is that I need to tell my server to receive mail from <> (emtpy or null user) as required by RFCs
I have installed and configured a lot of Collaboration Suites and I never needed to do that!
Where does the install guide say that you need to do this?