电子邮件由PHP Mailer和wp_mail使用垃圾邮件

Question

重复的问题。我找到了一些答案，但没有人工作。

我想使用Php Mailer发送电子邮件，或者在WordPress中使用附件PDF文件发送wp_mail。在PHP Mailer或wp_mail这两种技术中，电子邮件附带附件，但每次都是垃圾邮件。

使用PHP Mailer 1的代码

$cart

使用PHP Mailer2的代码

$mail->From = "from email";
$mail->FromName = "name";
$mail->AddAddress("to email");
//$mail->AddReplyTo( 'from email', 'name' ); //Line add or not doesn't effect.
$mail->AddAttachment("filename.pdf");    
$mail->Subject = "Email Subject";                  
$mail->Body = "Email Body";
if(!$mail->Send())
{
   echo "Message could not be sent. <p>";
   echo "Mailer Error: " . $mail->ErrorInfo;
}
else
{
   echo "Message sent";
}

使用wp_mail的代码

$mail->isSMTP();                                      
$mail->Host = 'smtp.gmail.com';  
$mail->SMTPAuth = true;                             
$mail->Username = 'email user name';                 
$mail->Password = 'password';                                          
$mail->Port = 587; //587 or 25


$mail->From = "from email";
$mail->FromName = "name";
$mail->AddAddress("to email");
//$mail->AddReplyTo( 'from email', 'name' ); //Line add or not doesn't effect.
$mail->AddAttachment("filename.pdf");    
$mail->Subject = "Email Subject";                  
$mail->Body = "Email Body";
if(!$mail->Send())
{
   echo "Message could not be sent. <p>";
   echo "Mailer Error: " . $mail->ErrorInfo;
}
else
{
   echo "Message sent";
}