Exchange 2013

I have an issue that when I add a certain user to a distribution list and send emails to that list it appears to have been sent but when I check the delivery report it shows that the status is pending and no one receives it. Once I take that particular user out the email gets delivered to the group. The user has a large mailbox but it's definitely not the largest on the list. I don't understand why. Emails can be sent to that particular user though.
fedosomwanAsked:
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Jian An LimSolutions ArchitectCommented:
http://technet.microsoft.com/en-us/library/bb430743(v=exchg.150).aspx

there is something called expansion if you sending to a DL group.
so in your case, i believed the DL expansion have some issues with AD replication or something like that
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fedosomwanAuthor Commented:
Thank you for this response and I've taken a look at the article, but if you were me where would you start?. I get the following from the discovery report whenever an email is sent to the group when those specific users are added:

Delivery Report for  Administrator ‎(Admin@xxyyzz.com)‎

Pending
9/8/2014 2:02 PM test.abcd.lcl
This message was redirected to another email address.

9/9/2014 9:27 AM test.abcd.lcl
Message delivery is taking longer than expected. There may be system delays. For more information, contact your helpdesk.

Now if I remove those specific users and send again, it gets delivered.
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fedosomwanAuthor Commented:
Another variation of the pending message is as follows:

Delivery Report for  Fox Hunt ‎(FHunt@xxyyzz.com)‎

Pending
9/9/2014 9:52 AM test.xxyyzz.lcl
The message has been transferred from test.xxyyzz.lcl.lcl to EXC01.xxyyzz.lcl.
Group Expanded
9/9/2014 9:52 AM test.xxyyzz.lcl
The list of members of the group "~Sales" was expanded so that the message can be delivered to each recipient

Needless to add that any help in this regard would be hugely appreciated.
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fedosomwanAuthor Commented:
One thing I feel I need to add is that these emails were working prior to our upgrade to CU5.
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Jian An LimSolutions ArchitectCommented:
let's go for cu6 and see whether it fix this?

and can you explain how many servers you have in your environment?

another note is to look at the journal mailbox to see whether it has expanded properly in journal ...

p/s: i am in training as a result i am slow in my reply..
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fedosomwanAuthor Commented:
I'm sorry it took a while for me to update this, but I have found a solution through the help of Microsoft technical support. I hope the following might help anyone else that gets this issue. Upon going through the event logs, we noticed that there were quite a few event id 1003 instances, like "Mail being queued in Poison Queue and getting event id 1003"

And the cause was DefaultMaxMsgTrkAgentInfoSize issues

The fix was to add the following key to the EdgeTransport config file in the bin directory of the exchange folder.
<add key="MaxMsgTrkAgentInfoSize" value="5120" />

and then restart the transport service, and viola all those emails from the poison queue can then be released and they get delivered. I want to thank everyone involved and hope this helps others.
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fedosomwanAuthor Commented:
It completely corrected my issue
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