Office365 und OAuth

<?php

//Import PHPMailer classes into the global namespace
use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\OAuth;
//Alias the League Google OAuth2 provider class
use Greew\OAuth2\Client\Provider\Azure;

//Tell PHPMailer to use SMTP
$mail->isSMTP();

//Enable SMTP debugging
//SMTP::DEBUG_OFF = off (for production use)
//SMTP::DEBUG_CLIENT = client messages
//SMTP::DEBUG_SERVER = client and server messages
// TODO: turn off for production
$mail->SMTPDebug = SMTP::DEBUG_SERVER;

//Set the hostname of the mail server
$mail->Host = SMTP_SERVER;

//Set the SMTP port number:
// - 465 for SMTP with implicit TLS, a.k.a. RFC8314 SMTPS or
// - 587 for SMTP+STARTTLS
$mail->Port = SMTP_PORT;

//Set the encryption mechanism to use:
// - SMTPS (implicit TLS on port 465) or
// - STARTTLS (explicit TLS on port 587)
$mail->SMTPSecure = PHPMailer::ENCRYPTION_STARTTLS;

//Whether to use SMTP authentication
$mail->SMTPAuth = true;

//Set AuthType to use XOAUTH2
$mail->AuthType = 'XOAUTH2';

//Start Option 1: Use league/oauth2-client as OAuth2 token provider
//Fill in authentication details here
//Either the microsoft account owner, or the user that gave consent
$email = SMTP_USER;
$clientId = CLIENT_ID;
$clientSecret = CLIENT_SECRET;
$tenantId = TENANT_ID;

//Obtained by configuring and running get_oauth_token.php
//after setting up an app in Google Developer Console.
$refreshToken = REFRESH_TOKEN;

//Create a new OAuth2 provider instance
$provider = new Azure(
[
'clientId' => $clientId,
'clientSecret' => $clientSecret,
'tenantId' => $tenantId,
]
);

//Pass the OAuth provider instance to PHPMailer
$mail->setOAuth(
new OAuth(
[
'provider' => $provider,
'clientId' => $clientId,
'clientSecret' => $clientSecret,
'refreshToken' => $refreshToken,
'userName' => $email,
]
)
);
//End Option 1

//Option 2: Another OAuth library as OAuth2 token provider
//Set up the other oauth library as per its documentation
//Then create the wrapper class that implementations OAuthTokenProvider
//$oauthTokenProvider = new MyOAuthTokenProvider(/* Email, ClientId, ClientSecret, etc. */);

//Pass the implementation of OAuthTokenProvider to PHPMailer
//$mail->setOAuth($oauthTokenProvider);
//End Option 2

//Set who the message is to be sent from
//For Outlook, this generally needs to be the same as the user you logged in as
$mail->setFrom($email, 'EasyTec');

//Set who the message is to be sent to
$mail->addAddress('oliver@slackertreff.de', 'Oliver Wagner');

//Set the subject line
$mail->Subject = 'PHPMailer Outlook XOAUTH2 SMTP test';

//Read an HTML message body from an external file, convert referenced images to embedded,
//convert HTML into a basic plain-text alternative body
$mail->CharSet = PHPMailer::CHARSET_UTF8;
$mail->msgHTML("Geht es am nächsten Tag auch noch?");

//Replace the plain text body with one created manually
$mail->AltBody = 'This is a plain-text message body';

//Attach an image file
//$mail->addAttachment('images/phpmailer_mini.png');

//send the message, check for errors
if (!$mail->send()) {
echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
echo 'Message sent!';
}