It is applicable for qmail + Plesk
All current messages will be removed from the queue in this case and cannot be restored.
1. Stop Qmail and xinetd.
2. Move current queue to another location.
mv /var/qmail/queue /var/qmail/queue_old
3 Reinstall ‘psa-qmail‘ RPM to recreate qmail queue structure with the command like:
rpm -Uvh --force psa-qmail (Redhat, Fedora, Cent oS )
qmail-qreadutility to read the messages headers:# /var/qmail/bin/qmail-qread