Might be a authentication issue ? Do you know what auth is supported by your server ? If you want to play with ag-tool supported values for 'smtp/authentication' are: Code: 0 - No auth 1 - Login (commonly used, but obsoleted by Plain) 2 - Plain (commonly used) 3 - CRAM-MD5 Unfortunately most common issue with SMTP seems to be restrictions to the connection done by the ISPs, i.e if you are not in their network it won't work.
0 - No auth 1 - Login (commonly used, but obsoleted by Plain) 2 - Plain (commonly used) 3 - CRAM-MD5
That's a already fixed bug, but does not matter what appear in the UI as long as the settings listed by ag-tool are correct, still does not work now ? Should be 2 in your case.
ag-tool update-service YOURACCOUNTID email int:smtp/authentication=2 ag-tool update-service YOURACCOUNTID email string:emailaddress=YOUREMAIL