MessageId Property
The Id of the message.
Syntax
public var messageId: String {
get {...}
set {...} }
Default Value
""
Remarks
The Id format is as in RFC 2822: id-left@id-right.
In AS1, customizing the MessageId is not supported. An appropriate MessageId will be generated by the class for each outgoing message. You should record this value after sending this value, and set it again when you verify the receipt.