This indicator shows the number of messages with delivery errors to the protected domain name.
In the near future, it will allow
quick access to a specific search result with the delivery status filter:
"Delayed delivery".
The information collected by our systems on this status, is usually from insufficient resources for the receiving server, but may be related to another reason, such as when the server is unreachable.
Example of information returned by the server in difficulty.
Delivery Delayed Delivery | 2023-01-22 08:20:02 | xxx.xxx.xxx.x | host xxx.xxx.216.34[xxx.xxx.216.34] said: 452 4.3.1 Insufficient system resources (UsedDiskSpace[C:\Program Files\MicrosoftExchange Server\V15\TransportRoles\dataQueue]) (in reply to end of DATA command