I just enabled the rule deny - x-dosexec No DOS executables No DOS programs allowed and it's started flagging attachment that aren't x-dosexec. It claimed a tif, some pngs, jpegs and a couple txt files. But if I do a file -i on them, they report their correct filetypes. This is on CentOS 4.6. I've disabled that rule and the issue stopped. -=Bobby