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2.1.3.6.2.1 Generating a Value for the Disposition Field

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The value of the Disposition field, as specified in [RFC3798], conforms to the following ABNF rule.

 disposition = "automatic-action/MDN-sent-automatically;" action_value
 action_value = "displayed" / "dispatched" / "processed" / "deleted" / "denied" / "failed"

The value of the action_value parameter is determined by the value of the PidTagMessageClass property ([MS-OXCMSG] section 2.2.1.3), as specified in the following table.

Value of PidTagMessageClass property

Value of action_value parameter

*.IPNRN

displayed

*.IPNNRN

deleted

The remaining 4 "disposition" values are not mapped to a specific message class and need not be supported by MIME writers.