I upgraded to version 4.30 yesterday and this morning our Exchange queue is full of failed bounce messages. The subject lines are ***Your message was blocked***. I see under the Advanced Settings, Anti-Spam tab you can edit the bounce message, but I'm not sure this is a good thing to be turned on at all. Questions:
1) How exactly is this working?
2) Can it be turned off?
3) Is this a new feature that wasn't in previous versions?