Client was not authenticated, Error

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< #5.7.1 SMTP; 530 5.7.1 Client was not authenticated> #SMTP#

This indicates that the Anonymous Users box is not checked in the configuration of the receive connector for Exchange.

http://krypted.com/windows-server/resolve-530-5-7-1-client-was-not-authenticated-error-in-exchange-2010-2012/

You need to update the configuration.