In the forums here I'm signed up to receive instant email updates for certain threads. It's always worked fine, until just a few days ago I started receiving delayed emails. Like the email would be sent out from this site instantly (I can see the date on the email), but then it wouldn't appear in my Gmail box until a day or two later. Anybody else experiencing this? It seems to only be happening with this particular forum.
From reading through the qmail remote queue, it looks like a massive spam flood started to bury the server as it tried to send error messages to unreachable smtp servers. So, I took some extra steps to block those messages in the first place and then flushed the queue of 600+ error messages waiting to send.