Little announcement: I am using a newsletter plugin in one of my q2a forums for over one year now and plan to release it as premium version.
What it does:
1. Users can subscribe to certain tags.
2. Each Wednesday (for example), a personal newsletter is sent to them if there are new questions to the subscribed tags.
3. Management of subscribed tags for each user etc.
Release will be in end of 2016.
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July 15, 2020: Q2A 1.8.5 released!