Here's what happened (for anyone who cares): We are a larger community than most forums (excluding the commercial forums like this one; of course they're enormous; that's not my point). The notifications option that was toggled spat out "Your thread was commented in by..." posts like nobody's business continuously, day in day out, and the host tagged it as spam, locked the account, and logged it in a support ticket. Of course it wasn't spam, but they didn't know that. I resolved the issue and I am currently waiting for it to be turned back on. When it is, the site will be in maintenance mode while I disable email notifications and daily email reports and the like.

I was actually getting to like that place

I had a feeling something like this might happen.