V
Vimal Rai1
We have an On-Premise Exchange 2019 Server. A user is randomly receiving NDRs with the mentioned error."Remote Server returned '550 5.1.11 RESOLVER.ADR.ExRecipNotFound; Recipient not found by Exchange Legacy encapsulated email address lookup"We have tried almost every solution found online, including:Emptying the Outlook Auto-Complete list several times.Reconfiguring his Outlook profile multiple times.Changing his devices.Assigning the OAB directly to his mailbox instead of via the Mailbox Database.Configuring his Outlook both with and without cache mode.There is a solution suggesting the crea
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