SMTP send emails with PHPMailer over TLS

MailController.php

<?php
    use PHPMailer\PHPMailer\PHPMailer;
    use PHPMailer\PHPMailer\Exception;

    class MailController {
        private $mailer;
      
        public function __construct($body,$subject)
        {
            $this->mailer = new PHPMailer(true);
//            $this->mailer->SMTPDebug = 2;
            $this->mailer->isSMTP();
            $this->mailer->SMTPKeepAlive = true;
            $this->mailer->Host = 'mail.host.test';
            $this->mailer->SMTPAuth = true;
            $this->mailer->Username = 'no-reply@mail.host.test';
            $this->mailer->Password = 'testmailpass';
            $this->mailer->SMTPSecure = 'tls';
            $this->mailer->Port = 26;
            $this->mailer->CharSet = "UTF-8";
            $this->mailer->isHTML(true);
            $this->mailer->setFrom('no-reply@mail.host.test', 'Mail Online');
            $this->mailer->addReplyTo('no-reply@mail.host.test', 'Mail Online');

            $this->mailer->Subject = $subject;
            $this->mailer->Body    = $body;

            return $this->mailer;
        }

        public function sendEmail($email)
        {
            $this->mailer->addAddress($email);
            // Add attachments
            // $this->mailer->addAttachment('/var/tmp/file.tar.gz');
            if ($this->mailer->send()) {
                echo 'Email Sended Successfully to '.$email.PHP_EOL;
            } else {
                echo 'Failed to Send Email'.$email.PHP_EOL;
            }
            $this->mailer->clearAddresses();
        }

        public function closeConnection(){
            $this->mailer->SmtpClose();
        }
    }
?>

//For optimized SMTPKeepAlive need to order the emails by host!
$mailController = new MailController($content, $subject);
$mailController->sendEmail($email);