Hi Shayne,
Apologies for not seeing this sooner. As far as I am aware, Edge is the only browser that is not supported. The script we've provided in our Help doc,
Automating Login to SmarterMail, should work when using Firefox, IE or Chrome. I have heard other reports of successful logins with this script, so I would encourage you to submit a ticket to the Support Department so they can determine what's causing this issue.
If you would like, I'd be happy to submit one of your Email Tickets on your behalf. (Keeping in mind that the ticket will be refunded back to your account for future use if this issue is determined to be caused by SmarterMail or the script we've provided.)
Andrea Free
SmarterTools Inc.
877-357-6278
www.smartertools.com