php - 通过 SPF 验证电子邮件

好吧，我想不通。我正在使用 PHPMailer 从我的域 - example.com 向我自己发送电子邮件。我正在向自己发送电子邮件。(测试 google 架构标记)，但电子邮件未经过身份验证。这是我用来向自己发送电子邮件的代码。

$mail = new PHPMailer();
$mail->isSMTP();
$mail->SMTPDebug = 2;
$mail->Host = 'tls://smtp.gmail.com';
$mail->Port = 587;
$mail->SMTPAuth = true;
$mail->SMTPSecure = 'tls';      
$mail->Username = 'myemail@gmail.com';
$mail->Password = '';
$mail->setFrom('myemail@gmail.com');
$mail->addAddress('myemail@gmail.com');

$mail->Subject = 'Microdata Test';
$html = '
<html>
    <head>
        <script type="application/ld+json">
        {
            "@context":       "http://schema.org",
            "@type":          "EmailMessage",
            "description":    "Check this out",
            "potentialAction": {
                "@type": "ViewAction",
                "target":   "https://www.youtube.com/watch?v=eH8KwfdkSqU"
                }
        }
        </script>
    </head>
    <body>
    <p>
        This a test for a Go-To action in Gmail.
    </p>
    </body>
</html>
';

$mail->msgHTML($html);
$mail->send();

这是我的 spf 记录: