code: public function setReplyTo($mail = '', $name = null)
      {
          if (strlen($mail) && Helper::isEmail($mail)) {
              if (!empty($name)) {
                  $_m = Helper::mailTagger($mail, $name);
              } else {
                  $_m = $mail;
              }
              $this->getMailer()->setRegistry('Reply-To', $_m, 'headers');
          }
          return $this;
      }
docs: Set Reply-To header field
  
  @param string/array $mail The email address to add, or an array of name=>email pairs
  @param string/bool $name The name to show for the email address if there is just one
  @return self