Urgent! Exchange NDR bounces

Hi,

In the last day I am getting many people reporting that they are receiving NDR responses back from our exchnage server. It appears to be when people are sending messages internally to one another.

Below is the error they receive.
-------------------------------------------------------------------------------
Delivery has failed to these recipients or distribution lists:

First and last name<mailto:user@domain.com>
There's a problem with the recipient's mailbox. Microsoft Exchange will not try to redeliver this message for you. Please try resending this message, or provide the following diagnostic text to your system administrator.

Diagnostic information for administrators:

Generating server: server.domain.com

email@address.com
#550 5.2.0 STOREDRV.Deliver: The Microsoft Exchange Information Store service reported an error. The following information should help identify the cause of this error: "MapiExceptionUnknownUser:16.18969:B5000000, 17.27161:00000000AC000000000000000000000000000000, 255.23226:20307830, 255.27962:FE000000, 255.17082:EB030000, 0.26937:08000000, 4.21921:EB030000, 255.27962:FA000000, 255.1494:00000000, 255.26426:FE000000, 2.25805:00000000, 4.11752:0F010480, 2.19149:00000000, 2.25805:00000000, 4.11752:0F010480, 2.22787:00000000, 4.13800:0F010480, 4.9448:0F010480, 0.16454:0F010480, 4.16966:0F010480, 4.31433:0F010480, 4.8620:EB030000, 255.1750:75733A20, 0.26849:00060000, 255.21817:EB030000, 0.26297:666F3A20, 4.16585:EB030000, 0.32441:63617469, 4.1706:EB030000, 0.24761:D9060000, 4.20665:EB030000, 0.25785:733A2030, 4.29881:EB030000". ##

________________________________
Sent by Microsoft Exchange Server 2007

----------------------------

Really need super urgent help as this is affecting our company.

Seems to be intermittent, one minute the person will bounce the next minute it will be fine. Also noticed authentication problems on a device that users LDAP to authentiocate remote users to the domain. Could be related.


Any ideas?

amerretzAsked:
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Viral RathodConsultantCommented:
1) Do you have Exchnge 2003 OR Exchnage 2007 ?\
2) Is there any critical exchnage Events recorded on the server ?

As per following Microsoft article 5.2.0 non-delivery report (NDR) message when you send an e-mail message to an Exchange 2007 server that is running the Isinteg.exe tool in a dismounted mailbox store

http://support.microsoft.com/kb/932515

Also Run EXBPA and check for the errors
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amerretzAuthor Commented:
Hi Thanks for the response.

We have exchange 2007. What I have noticed is that is only affecting newer users, not old ones that have been with company for years. I have a list of users who are sending bounce backs, and all of them are new people to the company.

When I go to exchange management console and go to the properties of their mailbox, in the general tab 3 fields do not have any information.

-Last logged on by

-Total Items

-Size

For any of my older users the information is visable.

Very strange. Any ideas?


I will run the EXBPA now.
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Viral RathodConsultantCommented:
How many Mailbox Store do you have ? ,Also Run EXBPA and check for the errors.

 
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amerretzAuthor Commented:
We have 3 storage groups.
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amerretzAuthor Commented:
Appears that it might be having issues pulling the info from adsi.edit or our DC.

When I type 'set' in a command prompt it is talking to one of my dc's.
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amerretzAuthor Commented:
BPA did not pull up anything that I think would be related.
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Viral RathodConsultantCommented:
1) It seems that the new user mailbox store is dismounted ,Can make sure that the new user located mailbox store is mounted and running fine

2) Is there any critical exchnage Events recorded on the server ?

You can also move the new user to any other store for testing purpose to make sure everything fine

Please Letus know the results.

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contactrobolCommented:
Do you have multiple ad ?

Check the replication of your domain controllers.
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contactrobolCommented:
The Microsoft Exchange Information Store service reported an error. The following information should help identify the cause of this error: "MapiExceptionUnknownUser:

Looks like exchange is unable to find the mentioned users.

It can be active directory replication.
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Viral RathodConsultantCommented:
Hello amerretz,,I have research the web and found,

What you should do is restart the MSExchangeMailboxReplication service on any CAS machine where this event is being encountered.  This error occurs because the MailboxReplicationService (MRS) currently caches Mailbox Database information past the lifetime of some databases.  Restarting the service will clear the cache.  Restarting the service should be a safe operation, and there will be no loss of service if there are no active/pending MoveRequests.

Please Restart the Microsoft Exchange Mailbox Replication Service and check the issue is persist or not

Ref:
http://social.technet.microsoft.com/Forums/en-US/exchange2010/thread/b4d45ec2-73e1-4e98-b15f-4e9a2d42d6c6/
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amerretzAuthor Commented:
Really weird, I just closed the exchange management console and then opened it again. All the users who are experiencing the issue are not in the list of users with a mailbox. They are just not there.....

If I close and restart the exchange management console they just reappear. This appears to be happening randomly.

This is starting to point more and more to AD rather than exchange.

I have looked at the event log on exchange and on the AD box and nothing strikes me as the cause of the problem.

We have 4 DC in the one site as I am move our 2 x 2003 dc's to 2 x 2008. So at the moment there are 4. I did the move months ago but just never finished it off yet and decommissioned the 2003 dcs yet. This only started happening yesterday. Everything was fine before then.

Tried restarting the replication service. Not change......

Thanks for all the comments so far, still no luck though.
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contactrobolCommented:
connect to dc1
add test 1 in description field  of the user in question properties
connect to dc2 check if the changes are passed on to other
if yes
that means replication working fine.

------------------------
as you said the new dc 2008
Exchange is unable to get authentication from those server.
So when user sends email . If exchange gets your 2003 it is authenticated
but when next time it connects to 2008 it fails that is where it gives u mapiunkown users
This is just a guess as i dont have access to your network to diagnose properly.

Get-logonstatistics username


replace username with the user having issue. past it here.


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contactrobolCommented:
Forget to mention run this command at exchange shell Get-logonstatistics username  Hit enter

Paste the result masking ur ips.
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contactrobolCommented:
Which service pack you are running on exchange ?
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contactrobolCommented:
To test that 2008 are the culprit . Remove those 2 dc 2008 server  from exchange hub transport.
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amerretzAuthor Commented:
I will try your suggestions, thanks for the assistance so far.

I actually have logged a job with Microsoft and they are connected in right now investigating. Not having much luck so far.....

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contactrobolCommented:
Make sure ask MS to update your exchange with latest Sp if you havent done yet.
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Viral RathodConsultantCommented:
Thanks for the update ,Please keep us updated ,If you need any additional information, please feel free to get back to us. We would be glad to assist you further.
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MegaNuk3Commented:
I reckon MS will ask you to install SP3 for Exchange 2007 and run "setup.com /prepareAD"
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amerretzAuthor Commented:
Ok, so MS fixed it. Ended up being a DC that was switched on after being off for a month, wouldnt replicate and hence was tombstoned, exchange was trying to connect to it. We manually removed the DC and switched it off and deleted all references to it.

Thansk for all your help guys, really appeciate it!

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Viral RathodConsultantCommented:
Thanks for the update and points ,have a greate day .
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