Delphi DLL

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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var
success: Boolean;
email: HCkEmail;

begin
success := 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.

email := CkEmail_Create();

success := CkEmail_LoadEml(email,'qa_data/eml/dsn_bounce.eml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkEmail__lastErrorText(email));
    Exit;
  end;

//  Read individual fields from the message/delivery-status part.
Memo1.Lines.Add('Action: ' + CkEmail__getDeliveryStatusInfo(email,'Action'));
Memo1.Lines.Add('Status: ' + CkEmail__getDeliveryStatusInfo(email,'Status'));
Memo1.Lines.Add('Final-Recipient: ' + CkEmail__getDeliveryStatusInfo(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_Dispose(email);