@SCHOWDHURY, were you able to get this figured out? I'm set up using a bridged network and my email account is set up using (smtp.gmail.com, port 465, use smtps yes). The Receiver connection is fine, but Sender fails to establish a session for email server "Exception caught connecting to email server; java.net.UnknownHostExceptions: vapp: vapp: unknown error". I'm using VirtualBox for this. The same email configuration works fine with VMWare Fusion.
I am facing the same issue on sender (Exception caught connecting to email server; java.net.UnknownHostException: vapp: vapp: unknown error) on Virtual box(pvs 7.1.9) running on mac - can you suggest me what needs to be done.
On receiver too I get an error:
The server indicated that the authentication credentials for this Email Account are incorrect.