linequest/controller/mailsender.php

<?php

require '../lib/phpmailer/Exception.php';
require '../lib/phpmailer/PHPMailer.php';
require '../lib/phpmailer/SMTP.php';
require_once ('../config/linequest.php');

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

function send_mail($recipient, $subject, $message) {

    global $CFG;

    $mail = new PHPMailer(true);
    $mail->isSMTP();
    $mail->SMTPDebug = 2;
    $mail->Host = $CFG->smtp->host;
    $mail->Port = $CFG->smtp->port;
    $mail->SMTPAuth = true;
    $mail->Username = $CFG->smtp->username;
    $mail->Password = $CFG->smtp->password;
    $mail->CharSet = 'UTF-8';
    $mail->setFrom($CFG->smtp->from, $CFG->smtp->from);
    $mail->addReplyTo($CFG->smtp->from, 'no-reply');
    $mail->IsHTML(true);
    $mail->addAddress($recipient, $recipient);
    $mail->Subject = $subject;
    $mail->Body = $message;

    return $mail->send();
}

?>