We have collected information about Delivery Type Shadow Redundancy for you. Follow the links to find out details on Delivery Type Shadow Redundancy.
https://docs.microsoft.com/en-us/Exchange/mail-flow/transport-high-availability/shadow-redundancy
Shadow redundancy was introduced in Exchange 2010 to provide redundant copies of messages before they're delivered to mailboxes. In Exchange 2010, shadow redundancy delayed deleting a message from the queue database on a Hub Transport server until the server verified that the next hop in the message delivery path had completed delivery.
https://docs.microsoft.com/en-us/exchange/shadow-redundancy-exchange-2013-help
Shadow redundancy was introduced in Microsoft Exchange Server 2010 to provide redundant copies of messages before they're delivered to mailboxes. In Exchange 2010, shadow redundancy delayed deleting a message from the transport database on a transport server until the server verified the next hop in the message delivery path completed delivery.
https://www.networkworld.com/article/2232525/understanding-shadow-redundancy-in-exchange-2010.html
One of the improvements made in Exchange 2010 is the redundancy built-in to the routing of messages through the Exchange environment. Microsoft built-in a technology they call “Shadow Redundancy” which the concept behind shadow redundancy is that a message is not deleted from the queue until the next hop has confirmed delivery to the subsequent hop.
https://www.experts-exchange.com/questions/27556011/Shadow-Redundancy-Messages-stay-in-queue-even-after-confirmed-delivery.html
kindly check the same with your environment, and if there is no confirmation from delivery from the last server( which can support Shadow redundancy) to deliver email. the availble copy of the hub wont be deleted. check the next destination hop of the email to understand the situation.
https://docs.microsoft.com/en-us/Exchange/mail-flow/transport-high-availability/transport-high-availability
Shadow redundancy recognizes both database availability groups (DAGs) and Active Directory sites as transport high availability boundaries. This reduces the number of servers that can hold redundant copies of messages, and eliminates unnecessary redundant message maintenance traffic across DAGs or Active Directory sites. For more information, see Shadow redundancy in Exchange Server.
https://community.spiceworks.com/topic/1953880-shadow-redundancy-queues-holding-mails-hostage
Jan 23, 2017 · Ultimatly I found the documents in the queue-browser on the VM machine, where they seemed to be stuck in the queue that has the FQDN for the physical server. Checking the physical server, the queue with the FQDN for the VM server also held a load of messages. Both named as a 'Shadow redundancy' queue.
https://www.tek-tips.com/viewthread.cfm?qid=1731053
The shadow redundancy queue is a place where a temporary copy of messages go until a delivery confirmation is received that the original copy was delivered. So the messages in that queue don't really need to be delivered--they are supposed to expire once confirmation is received.
https://docs.microsoft.com/en-us/Exchange/mail-flow/queues/queues
Delivery Type in Queue Viewer DeliveryType in the Exchange Management Shell Description NextHopCategory NextHopDomain NextHopConnector; Delivery Agent: DeliveryAgent: The queue holds messages for delivery to recipients in a non-SMTP address space that's serviced by a delivery agent and a Delivery Agent connector.
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