IIRC the only way you receive emails for responses to a topic is because you checked "Follow This Topic"? So as FEET said, just uncheck "Follow This Topic".
There can also be something in your Profile. In your Profile click "Notifications" and then click "Primary Notifications". See if "Email me whenever someone posts to any content I specifically follow." is check marked and if so, un-checkmark.
You receive emails because you most likely replied to the post at one time or another. At the upper left is the unfollow link. Go to the post using the email link and uncheck it.
When you block a person, they can no longer invite you to a private message or post to your profile wall. Replies and comments they make will be collapsed/hidden by default. Finally, you'll never receive email notifications about content they create or likes they designate for your content.
Note: if you proceed, you will no longer be following .
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