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Is Port25 blocked?

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WhiteTiger:
A server in DMZ sends error messages to an external email address.
The server that should receive them rejects them on port 25.
From a first check it would seem that the ISP does not block port 25 on incoming, but only on outgoing.

While waiting for their confirmation, I wonder if it is OPNsense+Zenarmor blocking it.

WAN, LAN, DMZ networks do not have my own blocking rules. On the contrary, there is still a Protocol Any / Ports Any / Sources Any / Destinations Any rule.

sy:
Hi,

What about Zenarmor block reports? Do you see any block record in Live sessions - Blocks?

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