Some of you may have noticed that you weren't receiving email updates on threads you were subscribed to and/or emails letting you know you had private messages, etc..
We switched email providers recently and after working just fine for a month, they decided to deactivate our domain until we provide some additional verification. Unfortunately, they didn't notify us of this and we had to discover the issue in the forum logs after seeing a drop in activity (and not receiving updates on subscribed threads ourselves) - so the problem has lasted at least a few days now.
The issue is currently ongoing, but it should be resolved today. I will update this thread once I verify that everything is working again.