Issues with ExchangeLegacyDN on Exchange 2016

I had this question after viewing EMail showing From: /O=FIRST ORGANIZATION/OU=EXCHANGE ADMINISTRATIVE GROUP (FYDIBOHF23SPDLT)/CN=RECIPIENTS/CN=users name.

Where would I set the LegacyDN on the mailbox. In my case, the LegacyDN appears to be set correctly in Active Directory and on the Exchange server but the problem persists.

I have this issue with only one of our mailboxes.

Best wishes,

Dan
Daniel AndersonAsked:
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timgreen7077Exchange EngineerCommented:
This is an x500 address and you would add the address to the email address proxy addresses. see below link for screenshot of where to add it.

https://social.technet.microsoft.com/Forums/ie/en-US/857982ba-b1d3-4a06-a06b-d93fadc3081b/how-to-add-x500-addresses?forum=exchangesvrdeploy
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Daniel AndersonAuthor Commented:
Hi timgreen7077,

Thanks for the reply. I have done this before, but apparently, the problem still persists. I got the LegacyExchangeDN from the AD user and I also checked the mailbox properties and it's set there too.

I added again now the X500 address to see if this fixes the problem, I also updated to the latest CU so hopefully the combination of everything fixes the issue. Is there anything else I can check out of interest?

Cheers,

Dan
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timgreen7077Exchange EngineerCommented:
where are you seeing this. is it in outlook? if it is just delete that address from the outlook auto complete cache.
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Daniel AndersonAuthor Commented:
Hi timgreen7077,

This is only seen in the affected users sent folder. The recipient sees the correct address.

Cheers,

Dan
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timgreen7077Exchange EngineerCommented:
If its in the users sent folder that means that he was the sender, so delete that address from the user's outlook autocomplete cache. Yes the recipient will see the correct address.
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timgreen7077Exchange EngineerCommented:
Reassigning points.
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timgreen7077Exchange EngineerCommented:
closing question unless author reopens.
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