I have set up the WP SFTP Mail settings plugin so that I can send emails from WordPress securely with authentication. Running the test email from this plugin works fine. 

However all the comment notification emails come back with "Please turn on SMTP Authentication in your mail client" and "is not permitted to relay through this server without authentication.". 

My question is, does the wpDiscuz plugin use the core wp_mail hook? Is there anywhere in the wpDiscuz plugin where I would have to provide my SFTP mail server settings separately ?

Thanks