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Getting NDR ( Remote Server returned ‘550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found’) for existing User.

when any user tries to send email for specific user the all get the following message: Delivery has failed to these recipients or groups:  ‘user name’ The email address you entered couldn’t be found. Please check the recipient’s email address and try to resend the message. If the problem continues, please contact your helpdesk. Diagnostic… Continue reading Getting NDR ( Remote Server returned ‘550 5.1.1 RESOLVER.ADR.ExRecipNotFound; not found’) for existing User.