As an owner of SAS-L (along with upteen other lists), if several rejections from a user come into my box over 2 days, I delete the person. It may not be fool proof, but I don't have the time to spend tracking down each postmaster, and asking if the account is in fact defunct. If your system is sending back messages saying unable to deliver for one of ten reasons, one of which might be box full or another is account deleted, I will delete that person. I'm using the LISTDEL XEDIT that I offered on this list a while ago, and several others are also using. Harry