Dart

Attach an Email to Another Email

Demonstrates the Chilkat Email.AttachEmail method, which attaches a copy of another email to this email object. The attached email is encapsulated in a message/rfc822 subpart. Because a copy is attached, later changes to the source email do not affect the embedded message. This example attaches one email to another.

Background: "Forward as attachment" produces exactly this structure: the original message is embedded whole as a message/rfc822 part rather than quoted into the body. This preserves the original's headers and formatting intact, which matters for forwarding to a mailbox that will re-parse it, or for reporting spam/phishing with the original evidence attached. Such parts are counted by NumAttachedMessages.

Chilkat Dart Downloads

Download Chilkat for Dart

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // Demonstrates the AttachEmail method, which attaches a copy of another email to this email
  // object.  The attached email is encapsulated in a message/rfc822 subpart.

  final innerEmail = CkEmail();
  innerEmail.subject = 'Original message';
  innerEmail.from = 'alice@example.com';
  innerEmail.body = 'This is the original message being forwarded.';

  final email = CkEmail();
  email.subject = 'FW: Original message';
  email.from = 'bob@example.com';
  email.body = 'See the attached original email.';

  // Attach a copy of the inner email as a message/rfc822 part.

  try {
    email.attachEmail(innerEmail);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('NumAttachedMessages = ${email.numAttachedMessages}');
}