I'm receiving a mail about one of my users like this: Some Users/Groups Are Near Or Already Over Their Quota Limit .... I've been searching on this site and yes, there's a problem in /tmp. There's a directory called /tmp/clamav-656eca0faf317851963e0b0479e0f492 with 11MB inside, owned by this user. Why is this there? Can I safely remove the complete directory? Can I prevent getting a directory like this, even for other users? thanks.