Exchange Issue

Exchange Upgrade Issue

Upgrade Exchange 2013 – Couldn’t resolve the user or group

Today, I run the maintenance to upgrade the Exchange Server 2013 from CU 20 to CU 23. However, I got the error on step 14 that says “Microsoft.Exchange.Data.Common.LocalizedException: Couldn’t resolve the user or group”. I checked and confirmed the user/group is already in Active Directory. Below is the full detail of the error. As you

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Exchange Server 2019 Image

Recipient not found by Exchange Legacy encapsulated email address lookup

When you send an email to a recipient, you get IMCEAEX NDR that said “Remote Server returned ‘550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Legacy encapsulated email address lookup’”. This issue is happening when you migrate a mailbox with no direct path. Resolution You need to create an X500 email address alias and set

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