Prevent sent emails treated as junk mails using php mail function

I wrote a PHP script to send emails.

My script is like this:

$headers =  'MIME-Version: 1.0' . "\r\n";
$headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
$headers .= 'From: [email protected]' . "\r\n";

// Email Variables
$toUser  = "[email protected]"; // recipient
$subject = "testing"; // subject
$body    = "<html><body><p>
             Example of including an image via html \<img\> tag:
             <br>
             <img src='../images/profile.jpg'>
             <br>
             My new picture
             <br></p></body></html>"; // content

if (mail($toUser,$subject,$body,$headers)) {
    echo "sent";
} else {
    echo "failed";
}

Well, of course I use a valid email address for sender and receiver. I did receive the email, but it goes to junk mail. So I went for google research. Is it because of my "header" script problem? If it isn't, then what could cause my script to send a junk mail? Any solution?


Solution 1:

Please try this:

$headers ="From:<$from>\n";
$headers.="MIME-Version: 1.0\n";
$headers.="Content-type: text/html; charset=iso 8859-1";

mail($to,$subject,$body,$headers,"-f$from");

Solution 2:

Perhaps the problem is that yahoo uses domainkeys verification, which will likely fail for your application given that the mail is not actually coming from yahoo's servers.