PowerBuilder

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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integer li_rc
integer li_Success
oleobject loo_Email

li_Success = 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.

loo_Email = create oleobject
li_rc = loo_Email.ConnectToNewObject("Chilkat.Email")
if li_rc < 0 then
    destroy loo_Email
    MessageBox("Error","Connecting to COM object failed")
    return
end if

li_Success = loo_Email.LoadEml("qa_data/eml/dsn_bounce.eml")
if li_Success = 0 then
    Write-Debug loo_Email.LastErrorText
    destroy loo_Email
    return
end if

//  Read individual fields from the message/delivery-status part.
Write-Debug "Action: " + loo_Email.GetDeliveryStatusInfo("Action")
Write-Debug "Status: " + loo_Email.GetDeliveryStatusInfo("Status")
Write-Debug "Final-Recipient: " + loo_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.


destroy loo_Email