Better PHP Mailer

/**

 * Replace wp_mail with native PHP mail()

 */

add_filter('pre_wp_mail', 'use_native_mail', 10, 2);

function use_native_mail($null, $atts) {

    $to = $atts['to'];

    $subject = $atts['subject'];

    $message = $atts['message'];

    $headers = isset($atts['headers']) ? $atts['headers'] : '';

    $attachments = isset($atts['attachments']) ? $atts['attachments'] : array();

    // Convert to array to string if needed

    if (is_array($to)) {

        $to = implode(', ', $to);

    }

    // Convert headers array to string if needed

    if (is_array($headers)) {

        $headers = implode("\r\n", $headers);

    }

    // Use native mail()

    mail($to, $subject, $message, $headers, $attachments);

    // Return true to prevent wp_mail from running

    return true;

}