Dart

Sending S/MIME Encrypted Email

Sends an encrypted email using the recipient's digital certificate from a .cer file. Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // The mailman object is used for sending and receiving email.
  final mailman = CkMailMan();

  // Set the SMTP server.
  mailman.smtpHost = 'smtp.comcast.net';

  // Load the .cer file into a certificate object.
  // When sending S/MIME encrypted email, it is the recipient's
  // certificate that is used for encryption.  Only the public key
  // is needed to encrypt.  The recipient is the only
  // one possessing the private key, and therefore is the only
  // one able to decrypt.
  final cert = CkCert();
  try {
    cert.loadFromFile('cknotes.cer');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Create a new email object
  final email = CkEmail();

  email.subject = 'This email is encrypted';
  email.body = 'This is a digitally encrypted mail';
  email.from = 'Chilkat Support <support@chilkatsoft.com>';
  email.addTo('Chilkat Blog', 'admin@cknotes.com');

  // Indicate that the email is to be sent encrypted.
  email.sendEncrypted = true;

  // Specify the certificate to be used for encryption.
  email.setEncryptCert(cert);

  try {
    mailman.sendEmail(email);
    print('Mail Sent!');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
  }
}