How to use smtp to send email in wordpress without smtp plugin?

The wp_mail() function relies on the PHPMailer class to send email through PHP’s mail function. The phpmailer_init action hook in wordpress allows you to hook to the phpmailer object and pass in your own arguments.

This action is initiated with `do_action_ref_array` rather than `do_action`. You still hook to it with `do_action`. However, there are some notable differences:

  • If you pass an array to `do_action_ref_array()`, each element’s value of that array is passed as a separate parameter to the callback.
  • If you pass an array to `do_action()`, the complete array is passed as a single argument including any keys.

This is an example of establishing an SMTP connection using the `phpmailer_init` action:

function my_phpmailer_example( $phpmailer ) {
    $phpmailer->Host = '';
    $phpmailer->SMTPAuth = true; // Ask it to use authenticate using the Username and Password properties
    $phpmailer->Port = 25;
    $phpmailer->Username = 'yourusername';
    $phpmailer->Password = 'yourpassword';
    // Additional settings…
    //$phpmailer->SMTPSecure = 'tls'; // Choose 'ssl' for SMTPS on port 465, or 'tls' for SMTP+STARTTLS on port 25 or 587
    //$phpmailer->From = "[email protected]";
    //$phpmailer->FromName = "Your Name";
add_action( 'phpmailer_init', 'my_phpmailer_example' );

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