Everything was working fine but now this issue striked again 
1. Out of the blue, I started to receive the “connection refused” error when sending e-mails. I then restarted all 6 containers and had to activate the mail accounts, but I was unable to do so as I was getting an “unknown” error message this time:
2. I did double-check the mail server settings and everything seemed fine:
3. I am using the docker script installation on ubuntu server 22.04, everything is up to date and was working fine up until yesterday.
4. The mailserver docker log seems fine, apart from that 7 days antivirus warning:
Starting clamd.amavisd: LibClamAV Warning: **************************************************
LibClamAV Warning: *** The virus database is older than 7 days! ***
LibClamAV Warning: *** Please update it as soon as possible. ***
LibClamAV Warning: **************************************************
[ OK ]
Starting httpd: [ OK ]
Starting OpenDKIM Milter: [ OK ]
Starting spamd: [ OK ]
Starting fail2ban: [ OK ]
Starting server
here are my server logs, as requested before: https://escritorio.brunoleonadvogado.com/Products/Files/HttpHandlers/filehandler.ashx?action=download&fileid=2589&doc=LzdzUUk4WS9WRXhwSFEyc09weFZWWGVTZXRab3ZmaE44MTJOcmIwT2NOND0_IjI1ODki0