I see that there is a work going on on topic subscription email notification...
I'm subscribed for several topics and this was working more or less ok for the last couple of month - I receive daily notifications.
But today... I already received 14 (!) notifications for 4 topics - two topics had 4 duplicate and another two had 3 duplicates each.
I appreciate that you are trying to improve this, but could you please stopping spamming my mailbox with duplicates?

If you need to test, its ok, but let people know what is going on.

Thanks!