The Exchange Messaging team has been notified by Cisco that two cloud based IronPort appliances are currently queuing up DoIT mail for any messages sent thru those servers. We believe there are currently just over 100,000 messages queued up for delivery.
Cisco support and their engineers are currently investigating the issue. However, at this time any mail that is sent to our users could be delayed. Once the issue is resolved, the queued messages should get delivered as expected.