The '{1}' queue average length exceeds {8} messages and number of messages entering the '{1}' queue ({2}) is greater than ...

The '{1}' queue average length exceeds {8} messages and number of messages entering the '{1}' queue ({2}) is greater than the number of messages entering the '{4}' queue ({5}) over last {3} seconds. This could mean that the Categorizer or an agent is underperforming on this server. If the '{6}' service is paused, new submissions from SMTP and the Mailbox server role will be rejected and will allow for the '{1}' queue to drain. Pausing the '{6}' service until the '{1}' queue is healthy is recommended.