PHP Pear Mail sending e-mails through office 365 Failed to set sender | STARTTLS is required to send mail

Question

I'm trying to send mail through an office 365 e-mail address but i can't figure out how to enable STARTTLS no matter what i search or try.

My code:

$fromemail='sender@email.com';
$host='smtp.office365.com';
$port=587;
$password='realpassword';

$headers = array('From' => $fromemail,'To' => $to,'Subject' => $subject,'Reply-To'=>$replyTo,'MIME-Version'=> '1.0','Content-type'=> 'text/html; charset=utf-8','Date' => date('r', time()));

$smtp = @Mail::factory('smtp', array('host' => $host,'port' => $port,'auth' =>false,'username' => $fromemail,'password' => $password,'debug'=>true,'secure'=>'starttls','socket_options' => array('ssl' => array('verify_peer'=>false,'verify_peer_name' => false, 'allow_self_signed' => true))));

$mail = @$smtp->send($to, $headers, $body);

I added 'secure'=>'starttls','socket_options' => array('ssl' => array('verify_peer'=>false,'verify_peer_name' => false, 'allow_self_signed' => true)) because I saw these options on the internet but it doesn't seem to work.

The response i'm getting:

DEBUG: Recv: 220 LO4P123CA0002.outlook.office365.com Microsoft ESMTP MAIL Service ready at Thu, 6 Oct 2022 15:07:58 +0000
DEBUG: Send: EHLO localhost

DEBUG: Recv: 250-LO4P123CA0002.outlook.office365.com Hello [194.65.78.182]
DEBUG: Recv: 250-SIZE 157286400
DEBUG: Recv: 250-PIPELINING
DEBUG: Recv: 250-DSN
DEBUG: Recv: 250-ENHANCEDSTATUSCODES
DEBUG: Recv: 250-STARTTLS
DEBUG: Recv: 250-8BITMIME
DEBUG: Recv: 250-BINARYMIME
DEBUG: Recv: 250-CHUNKING
DEBUG: Recv: 250 SMTPUTF8
DEBUG: Send: MAIL FROM:<sender@email.com>

DEBUG: Recv: 451 5.7.3 STARTTLS is required to send mail [LO4P123CA0002.GBRP123.PROD.OUTLOOK.COM]
DEBUG: Send: RSET

DEBUG: Send: QUIT

object(PEAR_Error)#9 (8) {
  ["error_message_prefix"]=&gt;
  string(0) ""
  ["mode"]=&gt;
  int(1)
  ["level"]=&gt;
  int(1024)
  ["code"]=&gt;
  int(10004)
  ["message"]=&gt;
  string(201) "Failed to set sender: sender@email.com [SMTP: Invalid response code received from server (code: 451, response: 5.7.3 STARTTLS is required to send mail [LO4P123CA0002.GBRP123.PROD.OUTLOOK.COM])]"
  ["userinfo"]=&gt;
  NULL
  ["backtrace"]=&gt;
...

Is this something that needs to be fixed in the office365 configurations or is the problem on my end?

PHP Pear Mail sending e-mails through office 365 Failed to set sender | STARTTLS is required to send mail

0 Answers0