When you will see email of facebook then at the very bottom of email you will be able to see a option which says unsubscribe or if it will not work then you can do one thing get into your facebook go to account setting at the very left side there will be some option click notification then click email in the middle of the screen second option then uncheck it :)
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When you will see email of facebook then at the very bottom of email you will be able to see a option which says unsubscribe or if it will not work then you can do one thing get into your facebook go to account setting at the very left side there will be some option click notification then click email in the middle of the screen second option then uncheck it :)