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Exchange 2010 message delivery time

I just received an email from my manager, who received an email from her manager about the following situation...I don't really have any answer here and just figured I'd ask for ideas at least to get direction as to where to look further.

-External Entity Person-A Emailed Person-B and CC'd Person-C. (person B & person C being local exchange 2010 mailboxes - possibly on different DB's0

-Person-B received the email at 2:11 PM and decided to forward the message to Person-C at 2:18 PM.

-At 2:41 the original the original message from External Entity Person-A arrived in the inbox of Person-C

Person-C noted the time difference of approximately 30 minutes between the time that Person-B received the message and the same message arrived in her inbox.

-->times all based out Outlook timestamps in the messages.

Can anyone give me any kind of explanation as to why this would be happening?  It's exchange 2010 in a DAG, F5 load balancers in front, possible different CAS servers but all active databases are sitting on a single DB.  I'd really like to avoid having to do message tracking and all sorts of nonsense over this, but I know that now everyone is going to be worried that their emails are showing up 30 minutes late.

Thanks in advance.
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miswhoi
Asked:
miswhoi
1 Solution
 
wolfcamelCommented:
there are a lot of factors and many depend on the sending server which you have no control over.
typically the sending server would have sent one message to your server with the instruction to send it to two mailboxes - in which case they should have got it about the same time.

However, if the sending server sent it as two messages then any sort of delay, or problem could have caused one to get through and the second to have been retried.
the retry interval is a setting on the sending server and 30mins would not be uncommon.
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miswhoiAuthor Commented:
thanks.  My same line of thinking.  I feel like I could go down a deep rabbit hole for something that isn't actually a problem at this point.
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