Tried logging in to one of my nations today, only to find out it CTE'd during the days' minor update a few hours ago.
Checked the email address associated with it and all necessary spam/bulk folders and realized I never received an email like I usually do, though I did receive emails for some of my other nations.
I will say I have had problems with emails from other services before (namely Discord), but not from NS until now. The inbox is on GMX/1&1 Ionos, if that's helpful.