(Perl) Office365 Send Email using SMTP with OAuth2 Authentication

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Demonstrates how to send email from smtp.office365.com using OAuth2 authentication.

Chilkat Perl Downloads Perl Module for Windows, MacOS, Linux, Alpine Linux, Solaris

use chilkat();

# 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 authorization via a web browser.  Afterwards, the access token
# can be repeatedly refreshed automatically (with no user interaction).

# 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.
$jsonToken = chilkat::CkJsonObject->new();
$success = $jsonToken->LoadFile("qa_data/tokens/office365.json");

$mailman = chilkat::CkMailMan->new();

$mailman->put_SmtpHost("smtp.office365.com");
$mailman->put_SmtpPort(587);
$mailman->put_StartTLS(1);

# Use your Office365 email address for the SmtpUsername.
$mailman->put_SmtpUsername("OFFICE365_EMAIL_ADDRESS");
$mailman->put_OAuth2AccessToken($jsonToken->stringOf("access_token"));

# Create a new email object
$email = chilkat::CkEmail->new();

$email->put_Subject("This is a test");
$email->put_Body("This is a test");
$email->put_From("MY_NAME <OFFICE365_EMAIL_ADDRESS>");
$success = $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.  
$success = $mailman->SendEmail($email);
if ($success != 1) {
    print $mailman->lastErrorText() . "\r\n";
    exit;
}

# If SendEmail failed because of "Failed to get initial SMTP Response", then it may be 
# a firewall or anti-virus blocking communications.
# See https://cknotes.com/smtp-office365-com-failed-to-get-initial-smtp-response/

$success = $mailman->CloseSmtpConnection();
if ($success != 1) {
    print "Connection to SMTP server not closed cleanly." . "\r\n";
}

print "Mail Sent!" . "\r\n";