ErpNext version 7 - Account Email Outgoing doesn't work

Iam trying to configure a Account Email using a provider outside the ERPnext default list.

From my email service provider, I have all the necessary configuration values that are needed for outgoing email provider like smpt server name and port.

After saving the conf values, I getting:

File “/usr/lib/python2.7/”, line 368, in getreply
raise SMTPServerDisconnected(“Connection unexpectedly closed”)
SMTPServerDisconnected: Connection unexpectedly closed

I wrote a minor script using python smtplib and it works as expected.
From server side I can sent email using mail utility.

So, anyone has any other idea of that I might missing ?

@kickapoo try debugging the connection parameteres in

Ty for the answer