Become superuser or assume an equivalent role.
Roles contain authorizations and privileged commands. For more information about roles, see Configuring RBAC (Task Map) in System Administration Guide: Security Services.
Run the old mail queue.
# /usr/lib/sendmail -oQ/var/spool/omqueue -q
The -oQ flag specifies an alternate queue directory. The -q flag says to run every job in the queue. Use the -v flag if you are displaying the verbose output on the screen.
Remove the empty directory.
# rmdir /var/spool/omqueue