Since last night or this morning, we don’t seem to receive notification emails, although we didn’t change our settings. Happened to another user too, I’m reporting this for two people.
(btw I just noticed that the posting form in the forum has an “Optional tags…” button, but it seems to not work - so here’s another bug report =) )
Thanks fro reaching out!
Inspecting this, it seems that the IPs of our underlying bare metals servers got blocked by our current Email provider. Connectivity to their SMTP port only fails when routing through them. Maybe we sent too many mails? 
We will migrate the outgoing emails to Scaleway TEM right now. This was planned anyhow but we now have an urgent need to prioritize this right now.
Outgoing emails work again! Now processed via Scaleway TEM. Docs update pending.
Heard! 
Can confirm that notification emails now work again, thanks!