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$$ANON_USER$$ avatar image
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Outlook replaces the name

trying to find out why Outlook replaces the custom name

office-exchange-online-itpro
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AndyDavid answered

If a message is authenticated ( i.e. "internal") , then recipient resolution resolves it to the corresponding directory entry:
https://docs.microsoft.com/en-us/exchange/mail-flow/mail-routing/recipient-resolution?view=exchserver-2019

Outlook itself doesnt replace anything.

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