Specifies the tracking token.
[Visual Basic .NET]
Public Field TrackingToken As String
[C#]
public string TrackingToken;
[JScript]
public var TrackingToken : String;
The tracking token is used to correlate an e-mail with a context. You can generate a tracking token with the GetTrackingTokenEmail message. If this field is unspecified it defaults to null. In this case, the SendEmail message generates a tracking token automatically.