PHPMailer why i get connection timeout error? - php

Question

In the company I work for we use microsoft exchange server and ofcourse ms outlook to send and recieve email.
on andriod we use exchange application as following to access our mail.
I am trying to use the following code to send emails IN php:
require 'PHPMailer/PHPMailerAutoload.php';
$mail = new PHPMailer;
$mail->SMTPDebug = 3; // Enable verbose debug output
$mail->isSMTP(); // Set mailer to use SMTP
$mail->Host = 'mail.dom-domain.com'; // Specify main and backup SMTP servers
$mail->SMTPAuth = true; // Enable SMTP authentication
$mail->Username = 'username'; // SMTP username
$mail->Password = 'password123'; // SMTP password
$mail->SMTPSecure = 'tls'; // Enable TLS encryption, `ssl` also accepted
$mail->Port = 587; // TCP port to connect to
$mail->setFrom('username#dom-domain.com', 'Mailer');
$mail->addAddress('recname#yahoo.com', 'Joe User'); // Add a recipient
//$mail->addAddress('ellen#example.com'); // Name is optional
$mail->addReplyTo('username#dom-domain.com', 'Information');
//$mail->addCC('cc#example.com');
//$mail->addBCC('bcc#example.com');
//$mail->addAttachment('/var/tmp/file.tar.gz'); // Add attachments
//$mail->addAttachment('/tmp/image.jpg', 'new.jpg'); // Optional name
$mail->isHTML(true); // Set email format to HTML
$mail->Subject = 'Here is the subject tls587';
$mail->Body = 'This is the HTML message body tls587 <b>in bold!</b>';
$mail->AltBody = 'This is the body in plain text for non-HTML mail clients tls587';
if(!$mail->send()) {
echo 'Message could not be sent.';
echo 'Mailer Error: ' . $mail->ErrorInfo;
} else {
echo 'Message has been sent';
}
but the page loads alot and I get this error:
2017-04-02 13:13:45 Connection: opening to mail.dom-domain.com:587, timeout=300, options=array ( ) 2017-04-02 13:14:48 Connection failed. Error #2: stream_socket_client(): unable to connect to mail.dom-domain.com:587 (Connection timed out) [/home/xxxxxxx/public_html/ml/PHPMailer/class.smtp.php line 294] 2017-04-02 13:14:48 SMTP ERROR: Failed to connect to server: Connection timed out (110) 2017-04-02 13:14:48 SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting Message could not be sent.Mailer Error: SMTP connect() failed. https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting

Answer 1

Keep noted that on your Android device you are mostly using Microsoft Active Sync via port 443. You do NOT use a native SMTP connection here via port 587 (which would be used via IMAP/POP3). The same is true for a plain Outlook connection where MAPI or MAPI over HTTP/Outlook Anywhere is used. Both do not use a native SMTP connection here and might be the reason why it isn´t working. BUT on your GMail Account you are mostly using IMAP as this isn´t an Exchange Server which support Microsoft Active Sync.
It might therefore possible that your Exchange Administrator didn´t configured the SMTP Connector for external Authenticated connections for Outlook users as this isn´t needed in your case and therefore disabled for security reasons. As you didn´t specify if you are the Exchange Administrator and which version you are using its not easy to give you a how to here. So instead of that, you should follow these howtos here from Microsoft:
Controlling SMTP Relaying with Microsoft Exchange
Configure authenticated SMTP settings for POP3 and IMAP4 clients in Exchange 2016
If you aren´t an Microsoft Exchange Administrator you can try to send emails via the Microsoft Exchange Webservices (see here). However as said above, the Exchange Administrator might run a special configuration here to secure the environment.