stop receiving mails from facebook

Simply:
1. log in
2. click "my account" at the top right
3. click "notifications" and choose what you DO and DO NOT want to be EMAILED about.

Use fb without mouse

Alt+/ : Search
Alt+m : Compose a new message
Alt+1 : Home page
Alt+2 : Your profile page
Alt+3 : Friend requests
Alt+4 : Your messages
Alt+5 : Notifications
Alt+6 : Account page
Alt+7 : Privacy
Alt+8 : Facebook's
Facebook page
Alt+9 : Facebook
Terms/Agreement
Alt+0 : Facebook help center