Twitter offering email notification if a follower retweets or favorites your Tweets

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Twitter has Tweeted users that they will start "rolling out an email notification that lets you know if someone you follow retweets or favorites one of your Tweets." Users currently receive email notifications when they receive new followers and when they are sent direct messages. Is this going to be a useful feature?, or just seem like more spam in your inbox? Leave us your thoughts below in the comments!