One person sending mails to me who he is i don't know i want block that mail?

Rule # 1 of emailing Dont open, dont reply, dont unsubscribe to mail from people you dont know. Spam ( email from strangers) is nothing but viruses, scams, unwanted ads, tracking info so they can sell your address to other marketing places. In which case, you just get more and more spam. Youre not even suppose to be in the spam folder except to take a look and make sure no good emails went into there, in error. Then delete it all. You can do this as often as needed. Go to your inbox page, and click Options> Mail Options> Spam Set your controls to only allow email from your contacts. You can block someone's address there too. You'll never be able to stop spam email..by doing this. Some of these people make new addresses daily or hourly even 80% of all email is spam.. so keeping it in the spam folder is like a trash bin, in a sense.