I don't think they stopped it but I'm having trouble, too.
Friday I didn't get much (if any) mail at all - in Mail.app and the web.
Suddenly in the early morning hours of Sat. it decided to let about a dozen messages thru.
But now, all day Saturday, I haven't gotten a single message. Very odd.
I checked the web, none there either.
I think they're just having a hiccup.