Dart

Office365 Send Email from Shared Mailbox

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Demonstrates how to send email from a shared mailbox, from smtp.office365.com using OAuth2 authentication. 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.

  // An Office365 OAuth2 access token must first be obtained prior
  // to running this code.

  // Getting the OAuth2 access token for the 1st time requires the O365 account owner's 
  // interactive authorizaition via a web browser.  Afterwards, the access token
  // can be repeatedly refreshed automatically.

  // See the following examples for getting and refreshing an OAuth2 access token

  // Get Office365 SMTP/IMAP/POP3 OAuth2 Access Token
  // Refresh Office365 SMTP/IMAP/POP3 OAuth2 Access Token

  // First get our previously obtained OAuth2 access token.
  final jsonToken = CkJsonObject();
  jsonToken.loadFile('qa_data/tokens/office365.json');

  final mailman = CkMailMan();

  mailman.smtpHost = 'smtp.office365.com';
  mailman.smtpPort = 587;
  mailman.startTLS = true;

  // In case of shared mailbox access using OAuth, the application needs to obtain the access token on behalf of a user
  // but replace the SMTP username with the email address of the shared mailbox.

  // Login using the shared mailbox email address for the username, and the access token for the password.
  // See Office 365 SASL XOAUTH2 format 

  // Use your Office365 email address for the SmtpUsername.
  mailman.smtpUsername = 'SHARED_MAILBOX_EMAIL_ADDRESS';
  mailman.oAuth2AccessToken = jsonToken.stringOf('access_token');

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

  email.subject = 'This is a test';
  email.body = 'This is a test';
  email.from = 'MY_NAME <SHARED_MAILBOX_EMAIL_ADDRESS>';
  email.addTo('John Doe', 'somebody@example.com');

  // Call SendEmail to connect to the SMTP server and send.
  // The connection (i.e. session) to the SMTP server remains
  // open so that subsequent SendEmail calls may use the
  // same connection.  
  try {
    mailman.sendEmail(email);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  try {
    mailman.closeSmtpConnection();
  } on ChilkatException {
    print('Connection to SMTP server not closed cleanly.');
  }

  print('Mail Sent!');
}