On my fresh mailcow installation (btw: works great, looks great… ), I can’t receive mails from one domain, that obviously doesnt SMTP with encryption.
On the sending domain, there is a report:
host server.example.de[188.8.131.52] said: 550 5.7.1 Session encryption is required (in reply to RCPT TO command)
The sending domain can’t change that - so I have to change the requirement for encryption :-(.
How to do that ?