Sometimes you have actually a reason to reclaim a mailbox indigenous back-up, since it was turned off by failure or a previous employee is hired again. However after restoring the mailbox, numerous (internal) users space not able to send email to the revived mailbox and also receive an error blog post like: shipment has failed to these recipients or groups. With the error password IMCEAEX #550 5.1.1 RESOLVER.ADR.ExRecipNotFound ##In various other Exchange version the message likewise contains Recipient not discovered by Exchange heritage encapsulated email resolve lookup.(This message could likewise show increase after migrating the mailbox to an additional forrest)


The first thing you most likely think that to settle the issue, is come delete the cached email attend to from Outlook, however that walk not fix the error message.

You are watching: 550 5.1 1 resolver adr exrecipnotfound not found


We just developed a brand-new account, with an old, restored mailbox, maybe we should restart the multiple sclerosis Exchange energetic Directory Topology service (or even the Exchange server). In this case, the did not work either.


So what is the systems to this problem!? ns was pointed in ~ this blog (credits come the writer of the blog!). It was the same error code we received, however not the exact same article (Recipient not discovered by Exchange tradition encapsulated email deal with lookup is missing from our message) but that renders no difference. That pointed me in the ideal direction, the LegacyExchangeDN was readjusted since we developed a new account/ revitalized the mailbox and also was not connected with the brand-new account.


Exchange inside still offers an X.500 addressing schema. So once an user sends an email internally to the restored mailbox, the old X.500 address is used and also therefor Exchange is no able to supply the email. The user who send the email receives a Non distribution Report (NDR) v the old ID in the kind of a IMCEAEX address.


We are able to rebuild the required X.500 address based ~ above the received IMCEAEX in the NDR by making use of a PowerShell script.Copy listed below PowerShell scipt:

$Direction = Read-Host “Ingrese IMCEAEX”$Remplazo=
("+2E", "." ))$Remplazo | ForEach $Direccion = $Direccion -replace $_<0>, $_<1> $Direccion = “X500:$Direccion” -replace “IMCEAEX-“,”” -replace “

Click on the Play switch to operation the script and also it will currently ask friend to enter the IMCEAEX, i m sorry you got in the NDR. That starts v IMCEAEX and ends through the domainname. 


Paste the in the PowerShell home window and push ENTER. You now receive the X.500 address.

The last step is to enter the received X.500 resolve to the revitalized mailbox. You deserve to do that by opened the user account from ADUC, on the Attribute Editor tab walk to proxyaddress.


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Peter Klapwijk, Nationale-Nederlanden

I`m an it Consultant life in The Netherlands through my wife and also two kids.

In 2020 I received the Microsoft MVP compensation for companies Mobility.

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My emphasis is top top cloud products readily available by Microsoft prefer Microsoft Intune, Office 365 and Azure.