I'm using Groupwise 8.0.2 90840

We're having a growing problem; literally.....

I have a SLES 10 server and the MAIL volume that I've setup to house my PO with all of it's data grows by hundreds of megs per day.
We're a fairly small school district, with only around 350 Groupwise users and they have no size limit on their storage space.

To give you an example, I was down to around 2gig's available on my total resource. I went into the volume and deleted enough other stuff to free up almost 13 gigs of disk space.
I'm already back down to around 5 gig available. So, in short, around 10 gigs have been chewed up in just under two months.

I've been working with Groupwise for a long time and have never seen this type of growth.

The question is, what tool or resource can I use to even troubleshoot this problem. At this rate, I'll have no disk left in 3 weeks time...