Thank you all for your feedback! In the past, we've encouraged a URL rewrite in IIS in order to configure this functionality; however, I'm happy to report that rewrite is no longer necessary! The ability to force HTTPS will soon be included in all products:
The ability to force HTTPS has been added in SmarterMail 16.x and will be available upon that release within this first quarter of 2017. It will be found in the Miscellaneous Settings > Server Info section. The Administrator will see the following settings: Require SSL and Allow domains to override SSL Requirement.
The ability to force HTTPS was added in SmarterTrack 11.0. In our current version, 12.x, this setting can be found at Settings > Configuration > Security > Options tab. The Administrator will see the following setting: Force all traffic over HTTPS.
The ability to force HTTPS was added in SmarterStats 10.0. In our current version, 11.x, this setting can be found at Settings > General Settings > Options tab. The Administrator will see the following setting: Force all traffic over HTTPS.
Prior to enabling this setting in SmarterMail, SmarterTrack or SmarterStats, you must ensure the product is set up as a site in IIS and have a valid SSL certificate in place on the server. (Note: This option will not be seen to those using the Hosted SmarterTrack helpdesk, as a secure connection is already in place on the SmarterTools servers.)
Thank you all again for your participation on this thread!