Mimail mutant maximises Mydoom misery - The devastation created by the Mydoom virus, which is still spreading, has been compounded by the detection of a previously unknown mutant of the Mimail virus. One in every five emails currently transmitted is thought to be carrying Mydoom, with four million infected emails thought to be in circulation. Internet security firm Panda Software said that variant 'S' of Mimail (W32/Mimail.S.worm) is very similar to its prolific predecessors and could not have arrived at a worse time.