Swift

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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func chilkatTest() {
    var success: Bool = 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.

    let email = CkoEmail()!

    success = email.loadEml(mimePath: "qa_data/eml/dsn_bounce.eml")
    if success == false {
        print("\(email.lastErrorText!)")
        return
    }

    //  Read individual fields from the message/delivery-status part.
    print("Action: \(email.getDeliveryStatusInfo(fieldName: "Action")!)")
    print("Status: \(email.getDeliveryStatusInfo(fieldName: "Status")!)")
    print("Final-Recipient: \(email.getDeliveryStatusInfo(fieldName: "Final-Recipient")!)")

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

}