I’m suddenly receiving the following error for all incoming messages:
delivery temporarily suspended: host my.mailcow.host[22.214.171.124] refused to talk to me: 421 4.3.2 All server ports are busy
I’m reading the Postfix documentation at http://www.postfix.org/STRESS_README.html, but I cannot understand how this can be solved in Mailcow.
Could you help me please?
Thank you very much!