Mailbaby as SMTP server

Your software
My Mautic version is: 4.4
My PHP version is: 7.4.30
My Database type and version is: 10.5.16-MariaDB

Your problem
My problem is:

Trying to use Mailbaby as a SMTP server but for some reason I can’t get it to work. I constantly get the error message:
“Connection could not be established with host :stream_socket_client(): unable to connect to (Connection refused)”

But I can send via mailbaby with other clients. Did anyone experience the same error?

Hi, are you sure your port 587 is open on your server?
Amazon likes to block it btw.

Thanks for getting back to me @joeyk , port is open.