PureBasic

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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PureBasic

IncludeFile "CkEmail.pb"

Procedure ChilkatExample()

    success.i = 0

    ;  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.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkEmail::ckLoadEml(email,"qa_data/eml/dsn_bounce.eml")
    If success = 0
        Debug CkEmail::ckLastErrorText(email)
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

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

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


    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure