Skip to main content

Duplicate legacyExchangeDN Properties

Had a case recently that wasn’t immediately obvious to resolve.

We had reports of a user that no one was able to e-mail due to duplicate addressing. At first look there was no duplicate addresses on the object. We were receiving the following NDR’s

There is a problem with the recipient's e-mail system. More than one user has this e-mail address. The recipient's system administrator will have to fix this. Microsoft Exchange will not try to redeliver this message for you. Please provide the following diagnostic text to your system administrator and then try resending the message after the problem has been resolved.

IMCEAEX-_O=ORGNAME_OU=EXCHANGE+20ADMINISTRATIVE+20GROUP+20+28FYDIBOHF23SPDLT+29_CN=RECIPIENTS_CN=NAME+2ESURNAME@DOMAIN.SUFFIX
#550 5.1.4 RESOLVER.ADR.Ambiguous; ambiguous address ##

Further investigations showed that there was a problem with the way that the user was shown in the Exchange Address Books. It seemed as though the object was being confused with another user with the same name.

Comparing the properties of the two users revealed that their legacyExchangeDN properties were the same. The result was that the users were being confused in the Address Lists and no one was able to e-mail either due to this duplication.

The resolution was to change the container name that represents the user to another unique value, we changed ours to the users sAMAccountName value.

o=EXCHORG/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=firstname.surname

to

o=Cymru/ou=Exchange Administrative Group (FYDIBOHF23SPDLT)/cn=Recipients/cn=sAMAccountName

The only problem with renaming this value is it will break reply ability if senders Outlook Cache is not removed.

As to how this happened, we believe it’s because we have multiple installations of the Quest Migration tools running against the same AD domain, and they happened to be migrating a user with the same name and populated the property with the same value.

Comments

Alex Bandit said…
Thanks for your wonderful informative post and i got a good knowledge to read your informational post dhaka sonargaon hotel

Popular posts from this blog

Convert Linked Mailboxes to User Mailboxes in Bulk

My organisation has gone through a massive migration project to unify Active Directories and Exchange organisations. As a result of these migrations a lot of mailbox migrations have resulted in a lot of mailboxes ending up as linked mailboxes even though their not.The official TechNet article on this explains how to disconnect the mailbox and re-attach it to the user account correctly as a user mailbox. http://technet.microsoft.com/en-us/library/bb201749(EXCHG.80).aspxAnother way to make this appear to be corrected is to manually change the “Recipient Type” AD property on the affected mailboxes. This though, is unsupported.Using the official method from Microsoft results in the loss of any specific mailbox information such as SMTP, x400 & x500 addresses, mailbox sizes and any other individual mailbox settings.Only e-mail addresses and mailbox sizes were important to me (I must admit, I forgot about mailbox sizes at first). I came up with the script below that would properly conver…

Creating a Windows PE 3 Bootable USB device

I’ve used Windows PE for a long time. And I’ve grown to love it. It’s an extremely useful tool, not just for OS installation, but for diagnostics.Since there’s a version of WinPe for x64 & x86 (& itanium) I like to keep both x64 & x86 on my USB stick. Essentially copying the each version to the root of the USB stick as needed. Meaning at any one time I have three copies of WinPE on my USB stick. Other applications I copy directly to my USB stick, so that I don’t have to remount the image every time i need another application added.Shortly after Windows 7 was released came a new version of WinPE, WinPE 3.0 on the Windows Automated Installation Kit.Preparing the USB stick. You’ll need to prepare the USB stick. To do this open a command prompt using Run As Administrator and use the following commands.diskpart
list disk
select disk 7
clean
create partition primary
select partition 1
active
format quick fs=fat32
assign
exitMake sure…