Exchange server napaka 550 5.1.11

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Remote Server returned ‘550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Legacy encapsulated email address lookup’

On-premise Exchange server give error 5.1.11 about recipient not found and it have to do with Exchange legacy. This usually happen when you migrate email.


You have to add X.500 email address. How to now value of this address? In Active Directory Users and computers opwn Attribute Editor in found “LegacyExchangeDN” value. Copy and then in Exchange Admin Center add as another email address with protocol X.500.

Now, you can reseive and send email again.


Works as system engineer in Slovenian Enterprise in Microsoft environment focusing on security, deployments, SharePoint, SCCM and CheckPoint firewall. Author of successful blog about IT security, Microsoft tips & tricks, social media, internet trends.

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