You probably right, I think I have some incorrect settings causing block outgoing emails.
I see that three staged users used to receive emails (all of them are service accounts, but replies for thier topics by staff are possible). I don’t know what kind of actions triggered those emails. Now any stage user, even a human (the first one) after activating it does not receive emails (Last emailed = none).
Sorry if I write wrong topic. Just want to inform my case, thanks for support.