All admin notifications suddenly stopped

Question

As an admin I used to have a smooth working site for a year and suddenly since a week ago all my new users's registerations, posts, comments' notifications and even users don't any more receive email confirmation sendouts. I am now confirming new email addresses manually but this can't last forever.

I have not changed any of the settings of my server or my site for at least a year. Any ideas on why these notifications have stopped?

Thanks.

This is my site.

Comments

What happens when you try to confirm your email manually? (e.g. it would be http://www.noorpods.com/?qa=confirm on your site)

Do you get any errors?

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No, I created a test username and I got it's emailcode from the database and created a link something like this: http://noorpods.com/confirm?c=p2aow8zo&u=jim and it was fine. The email got confirmed without any error.  Users get their access when I create them a confirmation link but I still dont receive any notification about new posts, new users etc from my site!

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Have you changed anything on your site recently? For example upgraded Q2A. If not, it sounds like a problem with your email provider or host.