Had the same issue, lost entire list of users. How did you reconnect them? I am hoping to recover files and hopefully SmarterMail converts the users.

We were able to locate the user files under the C:\SmarterMail\Domains\'example.com'\Users directory. If those are still in place, then you should be able to add them from the SmarterMail Admin site for your server. I tried to add the link to the KB article we'd used for that, but it looks like thats being blocked. Try Googling this:

Thanks to vivio technologies.. i followed the article and i was able to fix my mailboxes. to be exact, this is the article.. https://portal.smartertools.com/kb/a3202/restore-a-users-account-folders-or-emails.aspx