Delphi ActiveX

Count the Report Parts in a multipart/report Email

Demonstrates the read-only Chilkat Email.NumReports property, which is the number of report parts in a multipart/report email. A part is counted as a report when its Content-Type is message/* (except message/rfc822) or text/rfc822-headers. Use GetReport to retrieve the body of each report part; indexes are zero-based. This example loads a report email and prints each report part.

Background: When a message can't be delivered, the mail system usually sends back a bounce known as a Delivery Status Notification (DSN). DSNs use the multipart/report structure, which bundles several parts: a human-readable explanation, a machine-readable message/delivery-status part describing exactly what happened (recipient, status code, failing server), and often the original message's headers. Reading these report parts lets a program automatically detect and process bounces.

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var
success: Integer;
email: TChilkatEmail;
n: Integer;
i: Integer;

begin
success := 0;

//  Demonstrates the read-only Email.NumReports property, which is the number of report
//  parts in a multipart/report email (for example, a Delivery Status Notification).
//  Use GetReport to retrieve the body of each report part.  Indexes are zero-based.

email := TChilkatEmail.Create(Self);

//  Load a multipart/report email (such as a bounce / DSN message).
success := email.LoadEml('qa_data/eml/dsn_bounce.eml');
if (success = 0) then
  begin
    Memo1.Lines.Add(email.LastErrorText);
    Exit;
  end;

n := email.NumReports;
Memo1.Lines.Add('NumReports = ' + IntToStr(n));

for i := 0 to n - 1 do
  begin
    Memo1.Lines.Add('---- Report ' + IntToStr(i) + ' ----');
    Memo1.Lines.Add(email.GetReport(i));
  end;