dns - GOOGLE APP + PHP MAIL() = HOTMAIL 的垃圾邮件

Question

我使用 php mail() 命令发送的电子邮件被 hotmail 视为垃圾邮件。我使用谷歌应用程序。我的 Mx 记录是：

Pref    Hostname    
0   ASPMX.L.GOOGLE.com  
5   ALT1.ASPMX.L.GOOGLE.com 
5   ALT2.ASPMX.L.GOOGLE.com 
10  ASPMX2.GOOGLEMAIL.com   
10  ASPMX3.GOOGLEMAIL.com

我的PHP代码是：

    $to = "to_email@hotmail.com";

    $subject = "Subject";

    //headers and subject
    $headers  = "MIME-Version: 1.0\r\n";
    $headers .= "Return-Path: <$support@my.com>\n";
    $headers .= "Content-type: text/html; charset=utf-8\r\n";
    $headers .='Reply-To: '.$to.''."\n"; 
    $headers .= "X-Sender: <www.my.com>\n";
    $headers .= "X-Mailer: PHP\n";
    $headers .= "X-Priority: 1\n";
            $headers .= "X-MSMail-Priority: High\n";
    $headers .= "X-auth-smtp-user: support@my.com\n";
    $headers .= "X-abuse-contact: support@my.com\n";
    $headers .= "From: MyName <support@my.com>\r\n";



    $body .= "My text here here : <br />" .
             "" . "<br />" . "<br />" .
             "My Name";


    mail($to, $subject, $body, $headers);

也许我需要添加：

1. mail.my.com的MX 记录
2. a像mail.my.com这样的记录。123.89.89.09

请帮忙