I did have a set-up that deleted our junkmail automatically, but it was a modification in our webmail system(IMP/Horde). I put it in with the automatic trash removal maintenance. It would dump junkmail that had been in the folder for more than X amount of days. It would do this every login, daily, weekly, monthly, yearly, depending on how I set it up. Now we use ASSP and all I can say is WOW--it works great for our server...much less load...junkmail is just rejected. Another option is using the dungog spamassassin rpms. They cost a small amount, but allow more custom stuff, global settings, just deleting e-mail, forward to a junkmail account, individual account settings(if someone still wants a junkmail folder) etc...