Dart

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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Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // 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.

  final email = CkEmail();

  // Load a multipart/report email (such as a bounce / DSN message).
  try {
    email.loadEml('qa_data/eml/dsn_bounce.eml');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final n = email.numReports;
  print('NumReports = $n');

  for (var i = 0; i < n; i++) {
    print('---- Report $i ----');
    print(email.getReport(i));
  }
}