PHPMailer default configuration SMTP - php

Question

I know how to use SMTP with PHPMailer:
$mail = new PHPMailer();
$mail->IsSMTP(); // telling the class to use SMTP
$mail->SMTPAuth = true; // enable SMTP authentication
$mail->Host = "mail.yourdomain.com"; // sets the SMTP server
$mail->Username = "yourname#yourdomain"; // SMTP account username
$mail->Password = "yourpassword"; // SMTP account password
And it works fine. But my question is:
How can I configure PHPMailer to use these settings on default, so that I do not have to specify them each time I want to send mail?

Answer 1

Create a function, and include / use it.
function create_phpmailer() {
$mail = new PHPMailer();
$mail->IsSMTP(); // telling the class to use SMTP
$mail->SMTPAuth = true; // enable SMTP authentication
$mail->Host = "mail.yourdomain.com"; // sets the SMTP server
$mail->Username = "yourname#yourdomain"; // SMTP account username
$mail->Password = "yourpassword"; // SMTP account password
return $mail;
}
And call create_phpmailer() to create a new PHPMailer object.
Or you can derive your own subclass, which sets the parameters:
class MyMailer extends PHPMailer {
public function __construct() {
parent::__construct();
$this->IsSMTP(); // telling the class to use SMTP
$this->SMTPAuth = true; // enable SMTP authentication
$this->Host = "mail.yourdomain.com"; // sets the SMTP server
$this->Username = "yourname#yourdomain"; // SMTP account username
$this->Password = "yourpassword"; // SMTP account password
}
}
and use new MyMailer().

Answer 2

Can I not just edit the class.phpmailer.php file?
It's best not to edit class files themselves because it makes the code harder to maintain.

Answer 3

You can also use this hook:
/**
* Fires after PHPMailer is initialized.
*
* #since 2.2.0
*
* #param PHPMailer &$phpmailer The PHPMailer instance, passed by reference.
*/
do_action_ref_array( 'phpmailer_init', array( &$phpmailer ) );
From the source of the wp_mail function itself to modify the phpmailer class directly.