Cannot send email to Groups in Exchange using contact created by the directory connector. (4256251)

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Title

Cannot send email to Groups in Exchange using contact created by the directory connector.
Description

Cannot send email to Groups in Exchange using contact created by the directory connector.
User receives a NDR stating 550 5.7.1 RESOLVER.RST.AuthRequired; authenticaion required
Cause

This is caused by a configuration on the receive connector.
Resolution

Please verify that the receive connector has the following settings selected:
Externally Secured (for example, with IPsec) on the Authentication tab
and
Anonymous users and Exchange servers on the Permission Groups tab.

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