I had the same problem, and was geting really worried, but fortunately it is easy to resolve: go to your web hoster website (do you have a web forwarding service, or a web site? that was where mine was coming from) What happens is that spammers hijack all the addresses that are appropriate to you, ie sales@jobloggs, accounts@jobloggs, whereas you probably only use info@. Your hoster will have a section where you can refuse all other permutations of your email address, except the ones you specify. It worked for me, no more emails. I was getting hundreds a day, and those were just the ones that were bounced back.