DataFlex

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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DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoEmail
    String sTemp1

    Move False To iSuccess

    //  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.

    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End

    Get ComLoadEml Of hoEmail "qa_data/eml/dsn_bounce.eml" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoEmail To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  Read individual fields from the message/delivery-status part.
    Get ComGetDeliveryStatusInfo Of hoEmail "Action" To sTemp1
    Showln "Action: " sTemp1
    Get ComGetDeliveryStatusInfo Of hoEmail "Status" To sTemp1
    Showln "Status: " sTemp1
    Get ComGetDeliveryStatusInfo Of hoEmail "Final-Recipient" To sTemp1
    Showln "Final-Recipient: " sTemp1

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


End_Procedure