How do I repair/rebuild all Qmail configuration files and restore settings for all mailboxes?
Resolution:
This can be done with Plesk mchk utility:
# /usr/local/psa/admin/bin/mchk
Synopsis:
mchk [OPTION]
–without-spam – restore all settings except for SpamAssassin configuration
–with-spam – restore all settings
–spam-only – restore only SpamAssassin settings
This utility rebuilds in line with Plesk database Qmail control files in the /var/qmail/control, /var/qmail/users directories and mail users’ settings. Also, it sets proper ownership/permissions for all mailboxes (/var/qmail/mailnames/*).
Example:
# /usr/local/psa/admin/bin/mchk --with-spam
Source: Parallels KB