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https://community.spiceworks.com/topic/375184-how-can-i-get-exchange-2010-to-deliver-a-duplicate-email
Feb 05, 2016 · I use Exchange 2010 tracking log explorer and search for the emails and discovery the re-deliveries are being received, but treated as duplicate. I tried to delete the first email that was stripped by the WatchGuard, but another re-deliver still gets treated as a …
https://social.technet.microsoft.com/Forums/en-US/a1291b37-3839-485e-b552-9abdca58c783/event-duplicatedeliver-in-exchange-message-tracking
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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://www.experts-exchange.com/questions/24501780/Exchange-delivering-duplicate-emails.html
Find answers to Exchange delivering duplicate emails from the expert community at Experts Exchange
https://www.experts-exchange.com/questions/27734182/Duplicate-emails-on-Exchange-2010.html
- Could you even apply the last rollup post SP1 (Rollup6 post SP1) without apply SP2 ? - By design, duplicated email are avoided in Exchange by the uniqueness of the 'Message-ID' attribute seen in the SMTP header: if Exchange receive two mails with the same Message-ID then duplicate email is discarded by Exchange.
https://www.networkworld.com/article/2231006/duplicate-message-detection-bug-in-exchange-server-2010-ru-1-and-greater-.html
In case anyone encounters this, a customer of ours brought this to our attention. Basically, Exchange Server 2010 RU 1 or greater introduced a very odd Duplicate Message Detection bug.
https://docs.microsoft.com/en-us/Exchange/mail-flow/transport-high-availability/safety-net
Safety Net in Exchange Server. 2/8/2020; 11 minutes to read +6; In this article. In Exchange 2010, the transport dumpster helped protect against data loss by maintaining a queue of successfully delivered messages that hadn't replicated to the passive mailbox database copies in the database availability group (DAG). When a mailbox database or server failure required the promotion of an out-of ...
https://howdouc.blogspot.com/2010/08/user-message-delivery-reports-in.html
Aug 07, 2010 · User Message Delivery Reports in Exchange 2010 In my last post, I discussed a current bug in the Exchange 2010 transport layer that disabled correct read receipt processing. So I was wondering if there was any other way to handle this situation. That pointed me to a new feature in Exchange 2010 that enables users to perform message tracking on ...Author: Tim Harrington
https://answers.microsoft.com/en-us/office/forum/office_2010-outlook/outlook-2010-downloading-duplicate-emails-over-and/c4009b05-b8db-432b-b005-630cce0e2044
Aug 21, 2010 · Outlook 2010 downloading duplicate emails over and over. Hi, Outlook 2010 is downloading duplicate emails over and over again. I have the setting enabled to "Leave a copy of messages on the server" - I require this for my environment.
http://msexchangeguru.com/2013/04/22/transport/
Exchange Server transport: Shadow Redundancy, Bifurcation and Duplicate detection Introduced for the first time in Exchange 2010, Shadow Redundancy is a feature that provides redundancy for messages so long as they are in transit.
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