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Event ID: 3023 Source: MSExchangeTransport

A non-delivery report with a status code of 5.5.2 was generated for recipient <recipient>
Cause: This message indicates a general protocol error when SMTP protocols are out of sequence.    
Solution: View the SMTP log or run a netmon trace and ensure there are enough disk storage and virtual memory for SMTP to operate.
The SMTP error 5.5.2 usually indicates an error condition caused by the lack of storage (i.e. the hard disk is full and does not allow SMTP to function properly).
ME284204 provides a list of SMTP numerical codes and possible causes.

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