Clientmqueue keeps filling /var and I don't know why

[beandip]

I have a simple BAMP server for our intranet with FreeBSD 6.3 64bit.

It has been running flawless for 2.5 years but suddenly now I am having to go clear /var/clientmqueue everyday because it keeps filling my /var up and causes havoc.

I am guessing it has something to do with sendmail but I don't have anything configured to send out to my knowledge. The only thing I can think of is that I recently changed email servers and maybe it was sending something out (but I don't know what and why so much).

Any ideas?