Tuesday, July 24, 2007

530 5.7.1 Client was not authenticated

I got this error after sending an e-mail from an external domain over the internet to the exchange server, the message bounced with "530 5.7.1 Client was not authenticated" as error.
This is caused by the fact that I did not install an Edge Transport Server and did not specificly allow anonymous connections on the default receive connector.

By default Exchange 2007 servers not running the Edge Transport role will only accept inbound smtp connections from Exchange Users (clients), Exchange Servers (other Exchange 2007 servers) and Exchange Legacy Servers (legacy Exchange 2003 & below servers). To allow annonymous smtp connections for your server, run the following management shell command:

Set-ReceiveConnector -Identity "Default EXCHANGE" -PermissionGroups "AnonymousUsers"

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