I came across an error after upgrading a Plesk server from 8.6 to 9.2.3:

# /usr/local/psa/admin/sbin/mchk –with-spam
==> Checking for: mailsrv_conf_init… ok
==> Checking for: mail_mailbox_restore… ok
==> Checking for: mailsrv_entities_dump… ok
==> Checking for: mail_admin_aliases… ok
==> Checking for: mail_auth_dump… ok
==> Checking for: mailman_lists_dump… ok
==> Checking for: mail_responder_restore… ok
==> Checking for: mail_drweb_restore… ok
==> Checking for: mail_kav_restore… not exsists
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