Gets or sets the unique string (called message transmission envelope) which will be returned with delivery status notification messages.
The string which will be returned with delivery status notification messages. The default value is Empty.
The developer can set this property in order to be able to match notification messages with original messages. This is useful if many messages being sent and many delivery notifications being returned, and often used in bounced mail processing. For instance, this value will be available through OriginalEnvelopeID property of the delivery status notification message which will be sent by the destination mail server upon delivery (or not delivery) of your e-mail message.
DeliveryNotificationOptions Class | MailBee.SmtpMail Namespace