quequed messages need to be deleted

Hello,

We are using Java Communications Suite 6.3 running on Solaris 10.  I recently got a warning that a file system on the mail multiplexor is filling up.  After some investigation, I determined that messages have been queued up as far back as 2007, 307,000 messages to be exact, and are filling up the file system. 

I don’t' know a lot about this environment and before I go removing them with the standard Unix rm command I thought that I would check to make sure there is no harm, or should I clean these up with a mail command?

Thanks

Daryl