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我使用 PHPMailer 类。我写了一封这样的测试电子邮件：

$mail = new PHPMailer();
$mail->SMTPDebug  = 2;   
$mail->Username   = "username"; 
$mail->Password   = "aaa";  
$mail->SetFrom('mail', 'name');
$mail->AddReplyTo("mail","name");
$mail->Subject    = "PHPMailer Test Subject via smtp, basic with authentication";
$mail->MsgHTML('BODYYY OF MESSAGE');
$address = "address";
$mail->AddAddress($address, "name");
$mail->addCC("mail", "name");
$mail->AddAttachment("a.jpg");      // attachment
$mail->Send();

一切都很好，但它没有附加标题，我看到它仅在调用 DKIM_add 函数时附加的代码。如何在没有 DKIM_add 功能的情况下发送主题？

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