Updating SmarterMail to version 100.0.8495 or higher breaks the integration. For example, new mailboxes cannot be created:
mailmng failed: Incorrect Content-Type: must be textual to extract_string, JSON to extract_json.
In the recent SmarterMail update API, which was used by Plesk to manage mail server was seriously reworked, The task to rework how Plesk manages SmarterMail has ID PPPM-13966.
To apply a custom fix:
- Download the attached custom fix.
- In Plesk services Monitor: stop Plesk Management Service
- Unpack files from the attached archive to %plesk_bin% folder
- Start Plesk Management Service