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Although I don't really understand what tcpdump shows me, I tried with: tcpdump port 25 -A And it gave me this result (the fragment that I consider useful): With tcpdump port 26 -A it shows nothing Could it be that zimbra is not sending through port 26, despite having it configured...

Thank you very much for your help, I will do what you tell me to see if I find the problem

This is the pmgconfig dump: The main.cf The master.cf

Yes, as already mentioned, configure zimbra to deliver to PMG on port 26, and restart the zimbra server. In the PMG I configured the network where the Zimbra IP is. And this is what the log shows:

Yes, the network where this zimbra is in GUI-> Configuration-> Mail Proxy -> Networks

Hello everyone Install PMG as a relay for Zimbra, configure both for port 26 and my domain, but it rejects the emails that go out of my domain to other domains, with this error: NOQUEUE: reject: RCPT from unknown [192.168.xx.xx]: 554 5.7.1 <user@gmail.com>: Relay access denied; from =...