Follow these steps to deactivate and revert a SmarterMail installation back to the free edition, which allows to 1 domain and up to 10 mailboxes:
- Log in to your SmarterMail server as the administrator.
- Stop the SmarterMail service (MailService.exe).
- Navigate to the license.json file. Its default install path is C:\Program Files (x86)\SmarterTools\SmarterMail\Service\Settings\.
- Delete the license.json file.
- Start the SmarterMail service.