Dart

Auto-Generate or Explicitly Specify the Message-ID Email Header

Demonstrates how to auto-generate or explicitly specify the Message-ID header field. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  final email = CkEmail();

  email.subject = 'test';
  email.body = 'test';
  email.addTo('Joe', 'joe@example1.com');
  email.from = 'mary@example2.com';

  final mailman = CkMailMan();

  // When the mailman sends email, it renders the email to be sent,
  // and then sends the rendered MIME.

  // Instead of actually sending the email, this example will render
  // to MIME so we can see what would be sent..

  // We can explicitly set the Message-ID like this:
  mailman.autoGenMessageId = false;
  email.addHeaderField('Message-ID', '<xyz123@abc>');

  var mimeStr = mailman.renderToMime(email);
  print(mimeStr);

  // This is what we get:

  // MIME-Version: 1.0
  // Date: Mon, 20 Jul 2020 17:20:09 -0500
  // Message-ID: <xyz123@abc>
  // Content-Type: text/plain; charset=us-ascii; format=flowed
  // Content-Transfer-Encoding: 7bit
  // X-Priority: 3 (Normal)
  // Subject: test
  // To: Joe <joe@example1.com>
  // From: mary@example2.com
  // 
  // test

  print('--------');

  // If we auto-generate...
  mailman.autoGenMessageId = true;
  mimeStr = mailman.renderToMime(email);
  print(mimeStr);

  // We get this:

  // MIME-Version: 1.0
  // Date: Mon, 20 Jul 2020 17:21:20 -0500
  // Message-ID: <04EDE096BBFE484967F6398A973B0FCF6EA09A44@CHILKATSLICE>
  // Content-Type: text/plain; charset=us-ascii; format=flowed
  // Content-Transfer-Encoding: 7bit
  // X-Priority: 3 (Normal)
  // Subject: test
  // To: Joe <joe@example1.com>
  // From: mary@example2.com
  // 
  // test
}