Reply to email notifications

I present to you the idea, the implementation of which slightly simplifies communication in social services.

The idea is simple and consists in responding to e-mail notifications to which these notifications are received.

In this case, when you receive a notification, just click “reply”, type the text and send. Instead of:
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1. Follow the link.

2. log in if you have not authenticated before

3. Upload the entire post and comment tree.

4. Find comments, answer it.

I think for mobile devices is a very useful thing.

UPD: user cypok has notified that github has already implemented this idea earlier.