PHPmailer从内部标题加倍

Question

When I send a email by a PHP script the receivers sees two "from" addresses, like this

 Subject:   About this
 From:      [e-mail]
 From:      [e-mail]
 Receiver:  [e-mail]

How can I change or get the second from with the webserver out of there?

This problem occurs since the update of Apache and MySQL...

Before there wasn't a second from:

Any suggestions?

Here a little piece of PHP code what has been used.

  // Class start    
    $mail = new PHPMailer();
    $mail->IsHTML(true);

  // From
    $mail->From = $config['email'];
    $mail->FromName = $config['name'];

  // To         
    if(!is_array($email)){
        $mail->ClearAddresses();
        $mail->AddAddress($email);
        $mail->Send();
    } else{
        foreach($email as $email){
            $mail->ClearAddresses();
            $mail->AddAddress($email);
            $mail->Send();

If I take a look at email from before the update the Return Path + Sender (inside Header) are the same as the email adres. Like it should be.

But after the update the Return Path + Sender say [e-mail] so that looks like the problem?

I am now using SMTP and sendmail was giving these problems since the update. SMTP solved it.