hi all, I have an internal user trying to send an email to a distribution group in my company. The distribution group should not receive email from external senders so I have left the option ticket where all senders are authenticated the internal user is unable to send to the above group - the error below is in message tracking 550 5.7.1 RESOLVER.RST.AuthRequired; authentication required I do not understand this as the user is authenticated thanks

what client is used to send the message?

could you please follow below steps and let us if worked for you . Add-ADPermission "My Group" -User "MyUserName" -AccessRights ExtendedRight -ExtendedRights "Send As" Get-ADPermission "My Group" -User "MyUserName" | fl and then deleting the autocomplete from my outlook. Don't forget to mark helpful or answer connect me :- http://in.linkedin.com/in/satya11 http://facebook.com/satya.1000

What is the type of the DG you created Security or Distribution ? I know it is strange but the way you use to create the DG can make it fail ...

hi, Any update? thanks,CastinLu TechNet Community Support