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Event ID: 3027 Source: MSExchangeTransport

A non-delivery report with a status code of 5.7.1 was generated for recipient <recipient> (Message-ID <ID>). Causes: This message indicates that the sender was denied access or general access was denied. Solution: Check system privileges and attributes for the contact and retry sending the message.
You may have a firewall between the two exchange servers (i.e. a Cisco PIX firewall). Follow Microsoft’s ME320027 article for details.
As per Microsoft: "If you turn on maximum diagnostic logging on the MSExchangeTransport event source, this event is logged in the application event log when an e-mail message from an anonymous sender is blocked". See ME827616 for more details.

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