SMTP Mails don't send and connection fails, but openssl works

[supermathie (Michael Brown)]

@Trancos

I was able to send a test mail with openssl, but through port 587, though

Are you able to connect to port 587 from inside the container?

Sounds like you can connect on port 587 from the host but you might not be able to do so from inside the container which would mean a networking problem on your server.