I'm trying to set it up, but this is giving the following error when sending a test message in the Test Email tab.
CLIENT -> SERVER: QUIT
SMTP -> get_lines(): $data is ""
SMTP -> get_lines(): $str is "221 2.0.0 closing connection u38-v6sm209121ywh.46 - gsmtp"
SERVER -> CLIENT: 221 2.0.0 closing connection u38-v6sm209121ywh.46 - gsmtp
Connection: closed
SMTP Error: Could not authenticate.
This is just the end of the line.