If you Google that error message you will find that it is thrown by your SMTP server. Apparently (and at the risk of stating the obvious) your SMTP server does not support secure connections . I would first try to un-check the check box. If that doesn't work, I suggest you involve your SMTP server administrator in troubleshooting this.
HTH - Daniel.
If you prefer, you can set up a SMTP server local on NPrinting Server and use them as a Security Relay Server to gateway your reports to your main SMTP Server.
Here some posts to help you install and configure a smtp relay server.
in this post you have a step-by-step to do it.