procmail.cache.pag - 2 GB

hi
I discovered a file named procmail.cache.pag in the /var/webmin/ directory and that thing is over 2GB big.

I have some concerns about it, Do I need it, where does it come from, will it grow bigger, can I delete it/prevent the huge size?

also i noticed on may 11th there has been a 15GB transfer but I can't find out what it is. I have no log files about this and it's very unusual. Is there anyway to find out what could happened? I have no users that could possibly do this.

If this happens a few times then I will surely go over my traffic-limit and it seems I have no control over it.

thank you for any suggestions.

Status: 
Closed (fixed)