I am trying to setup Exchange Server 2007 to receive email from senders outside our network. Right now I am working with a test domain name, we'll call it testdomain.com. Whenever I send through my yahoo account to the address tester@testdomain.com, exchange sends back a bounce message that reads "530 5.7.1 Client was not authenticated". What does that mean and how do I correct it? Thanks.
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