Id assigned by Iguana uniquely identifying the received message within Iguana's logs.
The Message Log Id may be used to query Iguana for additional message-related information.
See
http://www.interfaceware.com/manual/iguana4_using_message_id.html
Note that Message Log Ids are not supplied to ResubmissionPreviewMessageReceived events, since Iguana does not assign Message Log Ids to resubmission preview messages.
DestinationMessageReceivedEventInputs Class | iNTERFACEWARE.Iguana.Plugin Namespace