SMTP Setup?

[Me.B]

I'm just trying to get to a client to connect over SMTP on one of the email addresses made over the panel.
I've updated some images on the post above.

And the issue is? Give him IP adress for first test, ditch the DNS here and resolve the problem step by step. If he fail while using IP. It means it's not the DNS involded.

He need to connect to port 25 and set ESMTP. If IP work while not domain check again DNS resolution.

I Can't guess issues from screenshots, it might mean a lot for you but not for me. So always give more infos so we can help.

M B