Are you a person who gives all your information(particularly Email address ) in the site registration forms or while downloading stuffs, then you will be knowing (or even suffering terribly) from the Spam Emails, than anyone else in the world.Spam Emails are mostly due to the misuse of your personal Email address by sites(that you have registered) to some spammers (who do this mainly to advertise there products or spread viruses).

Here is a solution for your problem ,There are many Sites in the Internet that provide a temporary Email Id's to you. you can use this Email while registering for a website or downloading some stuffs . if you wish you can also use these Emails as your permanent mail id's .if you google about this subject you would get quite a good number of websites like mytrashmail.com,temporaryinbox.com,,Mailinator, explodemail.com and etc.