Exchange Mail redelivery

Try to redeliver an email through my spam gateway but the user can't receive it. After checking in Exchange 2010, the email has been deliver to Exchange but it may refuse to redeliver it. Any idea ?

Tks
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AXISHKAsked:
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RammesteinConnect With a Mentor Commented:
When a message comes from the Internet, it generates an InternetMessage ID for each message. If this message id is same, it gets registered in the Database. It will consider it as a duplicate.

Theres a registry key which you can change to tell the Database not to keep this record.
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\<Server Name>\<Private/Public-Guid>\Track Duplicates (in hours)
make it greater then 49days say 55*24 hours.

Refer to the link below.
http://msexchangeteam.com/archive/2004/07/14/183132.aspx
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RammesteinConnect With a Mentor Commented:
It shows as duplicate...Which means the email was already delivered earlier due to which the new message is not delivered.This is by design.
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AXISHKConnect With a Mentor Author Commented:
Can we force to redeliver it for this email ? The reason is that the user has deleted the email together and empty the deleted Item..

Tks
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XCONBLRCommented:
if you have access to the message itself in eml format, we can redeliver those messages by changing the message ID field.

Message duplicate detection works on 2 criteria.
1. MessageID
2. Time stamp since the last email delivered with the same message ID.

If you either change the message ID or remove the message ID field from the message, it can get redelivered by dropping the message into pickup directory.
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Md. MojahidCommented:
have you check it out same thing with another user?
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AXISHKAuthor Commented:
Tks
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