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Sending mail to SMTP Relay with Authentication - How to send e-mails with SMTP Auth? PHP example

How to send e-mails with SMTP Auth? PHP example

PHP mail() does not usually allow you to use the external SMTP server and it does not support SMTP authentication — required by many a mail servers today, including ours.

To connect to our outgoing SMTP server from a PHP script using SMTP authentication and send an email:

  • unpack and upload to your server free package called PHPMailer, which can be downloaded here
  • create.php script that refers to the PHPMailerAutoload.php, included in the mentioned package
  • include and adjust the following settings accordingly in your script:
//This example shows making an SMTP connection with authentication.
//SMTP needs accurate times, and the PHP time zone MUST be set 
//This should be done in your php.ini, but this is how to do it if you don't have access to that date_default_timezone_set('Etc/UTC'); 
require 'PHPMailer/PHPMailerAutoload.php';

//Create a new PHPMailer instance 
$mail = new PHPMailer; 

//Tell PHPMailer to use SMTP 

//Enable SMTP debugging
// 0 = off (for production use)
// 1 = client messages
// 2 = client and server messages
$mail->SMTPDebug = 2;

//Ask for HTML-friendly debug output
$mail->Debugoutput = 'html';

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

//Set the SMTP port number - likely to be 25, 465 or 587
$mail->Port = 465;

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

//Username to use for SMTP authentication
$mail->Username = 'user@domain.tld';

//Password to use for SMTP authentication
$mail->Password = 'user-password';

//Set who the message is to be sent from
$mail->setFrom('email@from', 'Name');

//Set who the message is to be sent to
$mail->addAddress('email@to', 'Name');

//Set the subject line
$mail->Subject = 'Here is the subject';

//Message body
$mail->Body = 'This is the HTML message body in bold';

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

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

You will need the following details set:

  • host:
  • port: 465
  • SMTPsecure: ssl
  • SMTPAuth: true
  • username: mail username (usually your full e-mail address)
  • password: your mail password

Full documentation is here.

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