Apparently I have missed some setting on account creation and got
[NixOS Discourse] Summary email with
This summary is sent from [NixOS Discourse] when we haven't seen you in a while. Change [your email settings], or [click here] to unsubscribe. justification.
Is it really a good idea to opt-in people by default? (I unsubscribed, hopefully it will work)
I would be fine with notification specifically about my thread.