Postfix SMTP server: errors from unknown (after upgrade from 5x to 6x)

After upgrade, I’m getting hundreds of emails from Mail-in-a-Box with the following content:

Did you ever change postfix configuration? Specifically, what’s the output of postconf | grep notify?

Never changed anything. Just followed the official guide on upgrading the box and updating Mail-in-a-Box.

postconf | grep notify
notify_classes = resource, software

Interesting. The ip is a known bad actor.
Can you verify, e.g. from the headers or mail logs, that the mail is created by your local box?

Okay, where do I see a detailed log?

They’ve been hammering my box too, happens occasionally, though I don’t get the delivery error reports. Work-around - just stop them contacting your box:

sudo iptables -I INPUT -s -j REJECT --reject-with icmp-port-unreachable

PS.That will disappear on reboot, or you can remove the rule with iptables.

1 Like

Okay, it stopped now.
So, I just didn’t realize it was a “spam/ddos” attach or something like that; I thought it was an error in my setup.

Thank you for your assistance.

This topic was automatically closed 7 days after the last reply. New replies are no longer allowed.