We have been seeing issues the past couple of days with some of our customers’ mail being bounced by an error that states:

”Unable to deliver message to: domain.com Delivery failed for the following reason: (gateway IP)  responded with failure: 451 Message failed”

What is happening is that the antispam engine on our gateway is being bogged down when there is a heavy load of incoming messages.  We typically see this when there is a quirk in the backend database.  This is why we will be performing database mnaintenance on all of our gateways tonight around 11:59 PM CST.  During this time, our gateways will not be processing messages.  Once the maintenance is complete, operations should be back to normal, and these errors should be resolved.

We apologize for any inconvenience.  If you have any questions or concerns, please feel free to drop us a line at support@purity.net