Simulare un server SMTP per inviare Mail

[activ]

ho controllato anche la pillola... e i parametri nel php.ini sono corretti...

ho provato ad utilizzare questo esempio...

in locale funziona benissimo, online alcune email non me le invia

require("class.phpmailer.php");

$mail = new PHPMailer();

$mail->From     = "list@mydomain.com";
$mail->FromName = "List manager";
$mail->Host     = "smtp1.site.com;smtp2.site.com";
$mail->Mailer   = "smtp";

@MYSQL_CONNECT("localhost","root","password");
@mysql_select_db("my_company");
$query  = "SELECT full_name, email, photo FROM employee WHERE id=$id";
$result = @MYSQL_QUERY($query);

while ($row = mysql_fetch_array ($result))
{
    // HTML body
    $body  = "Hello <font size=\"4\">" . $row["full_name"] . "</font>, 

";
    $body .= "[i]Your[/i] personal photograph to this message.

";
    $body .= "Sincerely, 
";
    $body .= "PHPMailer List manager";

    // Plain text body (for mail clients that cannot read HTML)
    $text_body  = "Hello " . $row["full_name"] . ", \n\n";
    $text_body .= "Your personal photograph to this message.\n\n";
    $text_body .= "Sincerely, \n";
    $text_body .= "PHPMailer List manager";

    $mail->Body    = $body;
    $mail->AltBody = $text_body;
    $mail->AddAddress($row["email"], $row["full_name"]);
    $mail->AddStringAttachment($row["photo"], "YourPhoto.jpg");

    if(!$mail->Send())
        echo "There has been a mail error sending to " . $row["email"] . "
";

    // Clear all addresses and attachments for next loop
    $mail->ClearAddresses();
    $mail->ClearAttachments();
}