lib/mail/Mail.php
public function setReplyTo($email, $name = null)
    {
        if ($email instanceof ReplyTo) {
            $this->reply_to = $email;
        } else {
            $this->reply_to = new ReplyTo($email, $name);
        }
    }
public function setReplyTo($email, $name = null)
    {
        if ($email instanceof ReplyTo) {
            $this->reply_to = $email;
        } else {
            $this->reply_to = new ReplyTo($email, $name);
        }
    }
public function setReplyTo ( $ email , $ name = null ) { if ( $ email instanceof ReplyTo ) { $ this -> reply_to = $ email ; } else { $ this -> reply_to = new ReplyTo ( $ email , $ name ) ; } }
Add the reply to email address to a Mail object

@param string|ReplyTo $email Email address or From object
@param string|null $name Reply to name
Add the reply to email address to a Mail object