- Plesk for Linux
Note: This article has the reference to the issue with the fix available:
Index cache file stored in
/firstname.lastname@example.org/Maildir/dovecot.index.cache is calculated by Plesk statistics causing mail quota for particular domain exceeding its limit. This behavior is caused by the bug with ID PPPM-6617 .
Upgrade Plesk to the latest version using Plesk installer.