Riscrittura Send Mail da procedurale in classe

[sXe]

Ciao ragazzi, ho appena iniziato a studiare la programmazione OOP...

Sto cercando di trasformare la mia piccola applicazione sendmail in una classe, ma mi trovo bloccato da un errore mai riscontrato prima :

Warning: mail(): SMTP server response: 550 Address '<mymail@localhost>' not known here. in C:\xampp\htdocs\...\sendMail.class.php on line xx

Sicuramente avrò scritto qualche cavolata sapreste darmi un aiutino?
Grazie in anticipo, di seguito il codice.

sendMail.class.php

class sendMail {

    public $eol = "\r\n";
    public $form = '';
    //public $recipient = 'info@mysite.com'; // recipient adress
    public $recipient = ''; // testing recipient adress
    public $object = '';
    public $headers = '';
    public $body = '';
    //public $mittente = $settings['mail'];
    public $name = '';
    public $surname = '';
    public $company = '';
    public $address = '';
    public $phone = '';
    public $fax = '';
    public $mail = '';
    public $message = '';


    public $from = '';
    

    function __construct($infoMail) { 

        $this->recipient = $infoMail;

      } 

      function templateMail() {

          if ($this->company!=''){$this->from = ' da '.$this->company;}

        
        $this->object = "E-Mail dal sito mysite.com - ".$this->from.' ('.$this->name.' '.$this->surname.')'; // object of the E-Mail

        $this->headers = "From: ".$this->name.' '.$this->surname.' '."<".$this->mail.">".$this->eol;
        $this->headers .= "Reply-To: ".$this->name.' '.$this->surname.' '."<".$this->mail.">".$this->eol; // Reply-To info. Name and E-Mail
        $this->headers .= "Return-Path: ".$this->name.' '.$this->surname.' '."<".$this->mail.">".$this->eol;
        $this->headers .= "Message-ID: <".time()."-".$this->mail.">".$this->eol; // Info to help avoid antispam filters
        $this->headers .= "X-Mailer: PHP v".phpversion().$this->eol;

        $this->body = utf8_decode(trim(stripslashes($this->eol.$this->eol.
        'Nome e cognome : '.$this->name.' '.$this->surname.$this->eol.
        'Azienda : '.$this->company.$this->eol.
        'Telefono : '.$this->phone.$this->eol.  
        'Fax : '.$this->fax.$this->eol.
        'E-mail : '.$this->mail)).$this->eol);

        $this->body .= $this->eol;
        $this->body .= '--------------------------------------------------------------------------'.$this->eol;
        $this->body .= $this->eol;


        if (mail($this->recipient, $this->object, $this->body, $this->headers)) {    

                echo '<h1>Success!</h1>';
                echo '

';
                echo '
Name : ' . $this->name;
                echo '
Surname : ' . $this->surname;
                echo '
Company : ' . $this->company;
                echo '
Phone : ' . $this->phone;
                echo '
Fax : ' . $this->fax;
                echo '
Mail : ' . $this->mail;
                echo '
Message : ' . $this->message;
                echo '</p>';    

        }
        
        else {    echo '<h1>Fail!</h3>';    }

      }


} 

send-test.php

include '../common/sendMail.class.php';

        $obj = new sendMail($settings['mail']);    // $settings['mail'] viene letto correttamente, preso da file con settings vari

        $obj->name = $_POST['name'];
        $obj->surname = $_POST['surname'];
        $obj->company = $_POST['company'];
        $obj->phone = $_POST['phone'];
        $obj->fax = $_POST['fax'];
        $obj->mail = $_POST['mail'];
        $obj->message = $_POST['message'];

        $obj->templateMail();