clientmqueue (which is usually under /var/spool rather than under /var) is the queue for locally generated outbound email (like system emails). If you don't have sendmail running to process the mails and empty the queue, it will just fill up. So either run sendmail's queue runner (which should be running anyway, because it's the default in /etc/defaults/rc.conf) or find out why your local queue fills up. You can view the df* and qf* files to see where these mesages come from. Do take it seriously: you may have a compromised website on your system, used to send out spam.
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