Read Delivery-Status Fields from a Bounce

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Demonstrates the Chilkat Email.GetDeliveryStatusInfo method, which returns a named field from the message/delivery-status part of a delivery-status notification (DSN). It should be called only for an email identified as a delivery-status notification. This example loads a bounce message and reads its Action, Status, and Final-Recipient fields.

Background: When a message can't be delivered, the mail system returns a bounce as a multipart/report whose message/delivery-status part carries machine-readable fields: Action (e.g. failed), Status (a numeric code like 5.1.1 meaning "no such mailbox"), and Final-Recipient (the address that failed). Parsing these lets a program automatically detect hard bounces and prune bad addresses from a mailing list.

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bool success = false;

//  Demonstrates the GetDeliveryStatusInfo method, which returns a field from the
//  message/delivery-status part of a delivery-status notification (DSN / bounce).
//  Call it only for an email that is a delivery-status notification.

Chilkat.Email email = new Chilkat.Email();

success = email.LoadEml("qa_data/eml/dsn_bounce.eml");
if (success == false) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  Read individual fields from the message/delivery-status part.
Debug.WriteLine("Action: " + email.GetDeliveryStatusInfo("Action"));
Debug.WriteLine("Status: " + email.GetDeliveryStatusInfo("Status"));
Debug.WriteLine("Final-Recipient: " + email.GetDeliveryStatusInfo("Final-Recipient"));

//  Note: The path "qa_data/..." is a relative local filesystem path,
//  relative to the current working directory of the running application.