Each message contains a built-in facility for supporting application-defined property values. These message properties allow you to implement application-defined message filtering.
Message properties are name-value pairs that you can optionally insert into messages to provide structure. For example, in the .NET API the predefined message property ias_Originator, identified by the constant MessageProperties.ORIGINATOR, provides the message store ID that sent the message. Message properties can be used in transmission rules to determine the suitability of a message for transmission.
There are two types of message property:
Predefined message properties These message properties are always prefixed with ias_ or IAS_.
Custom message properties These are message properties that you defined. You cannot prefix them with ias_ or IAS_.
In either case, you access message store properties using get and set methods and pass the name of the predefined or custom property as the first parameter. See Message property management.
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