Missing emails again

For me the UA notification mails are broken again... I stopped receiving them and the last email I got was on 20-04-2016. Sinse then I should have received multiple emails on various questions I commented on... I checked my notification settings and they seem to be ok.

everything under:

On the things I follow, send me an email notification when there is:

is set to instant. And I automatically follow when I ask a question, answer or comment

I just wanted to make sure, could this be a problem on my end or are other people experiencing the same problems?

Also, the last mail I received from this no-reply email adress was on 21-04-2016, but that one was an Asset Store Notification. Which I suppose is not related.