Exchange 2010 ShadowRedundancy Queues growing

Posted on 2013-09-30
Medium Priority
Last Modified: 2013-10-14
Hey guys,

I am running and Exchange 2010 setup in a DAG.  I have 8 servers.  2 Mail, Hub, CAS & Edge.

One of our edge servers has about 9500 messages backed up in Shadow Queues with the next hops being our hub servers.

Mail is flowing as I can send myself external e-mail messages and get them immediately.

Any idea what would cause shadow copies of e-mails to hang in the edge queue?
Question by:Joel Parmer
LVL 45

Expert Comment

ID: 39533508
Don't worry about Shadow Queue. You can leave it, queues will reduced automatically.
LVL 63

Accepted Solution

Simon Butler (Sembee) earned 2000 total points
ID: 39534031
Shadow queues are copies of messages that are being delivered to another server, which Exchange holds until the message delivery is confirmed.
A small build up isn't unusual, but the numbers you are seeing (unless that is your expected mail flow in less than hour) is unusual.

The problems are usually around AV scanning something it shouldn't do, something else scanning the SMTP traffic or a suspect subscription to the Edge server.


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