Restoring mail configuration
Mchk is an internal utility intended for use by Plesk Control Panel. However, as administrator, you can use it for restoring the Qmail and Courier-imap configuration by internal Plesk database when needed. By default mchk is running in the background mode, to execute it in the foreground, use the -v option.
Example: /usr/local/psa/admin/sbin/mchk -v
You may not wish to restore SpamAssassin settings for mail accounts, as it requires running Perl interpreter. To speed up restoring use the –without-spam option.