I seem to have successfully installed mailcow on a debian VM, all services (or containers) seem to be running, but mails are not flowing in. As I’m in the process of migrating from an existing mailserver to mailcow, I changed the port forwarding (port 25) on my firewall to the mailcow host assuming mail would be redirected, but this doesn’t seem to be the case. This worked when testing another mailserver brand. When I revert to my running server, mails do eventually end up there.
One thing I must add: unbound gave the unhealthy error so I changed the healthy check to no in mailcow.conf after which it started up fine.
What can I do to troubleshoot?