Java

Read Delivery-Status Fields from a Bounce

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.

Chilkat Java Downloads

Download Chilkat for Java

Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean 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.

    CkEmail email = new CkEmail();

    success = email.LoadEml("qa_data/eml/dsn_bounce.eml");
    if (success == false) {
        System.out.println(email.lastErrorText());
        return;
        }

    //  Read individual fields from the message/delivery-status part.
    System.out.println("Action: " + email.getDeliveryStatusInfo("Action"));
    System.out.println("Status: " + email.getDeliveryStatusInfo("Status"));
    System.out.println("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.
  }
}