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.

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import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Email;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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.

        Email email = new Email();

        try {
            email.loadEml("qa_data/eml/dsn_bounce.eml");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            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.
    }
}