Error sending email via php mail function goes to spam

Question

I am facing problem in sending mail to my inbox (gmail account) but everytime it goes to spam folder. Here is the code snippet

     //$ticketDetail is array which contain required information to send.
       sendOwnershipEmail('dineshnagarscriet@gmail.com', $ticketDetail);

       function sendOwnershipEmail($email, $ticketDetail) {
            $param = new stdClass();


$param->content = "<div>
    <div><b>".$ticketDetail[0]['ticket_number']."</b></div><br/>
    <div><img src='".$ticketDetail[0]['image_path']."'/></div><br/>
    <div>Ticket with ticket number ".$ticketDetail[0]['ticket_number']." has been requested for tranfer from <div/>
    <div>".$ticketDetail[0]['oldDepartment']." to ".$ticketDetail[0]['newDepartment']." Department <div/>
  </div>";

            $param->sendTo = $email;
            $param->subject = "Request for Department transfer";

        sendMailFunction($param);
    }


    function sendMailFunction($param) {
            $to = $param->sendTo;
            $subject = $param->subject;
            $headers = 'MIME-Version: 1.0' . "\r\n";
            $headers .= 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
            $headers .= 'From: successive.testing@gmail.com' . "\r\n";
            $message = "<html><head>" .
                   "<meta http-equiv='Content-Language' content='en-us'>" .
                   "<meta http-equiv='Content-Type' content='text/html; charset=windows-1252'>" .
                   "</head><body>" .$param->content.        
                   "<br><br></body></html>";
          mail($to, $subject, $message, $headers);
    }

And I have tried a lot like setting headers as Reply-To, Return-Path etc but every time it goes to spam. Can u please figure out whats the problem?

Где Вы ищите свежие новости?
Лично я читаю и доверяю газете https://www.ukr.net/.
Это единственный источник свежих и независимых новостей.
Рекомендую и Вам — Feb 8, 2022

Niroj · Answer 1 · Jul 30, 2020

Hello @kartik,

Try changing your headers to this:

$headers = "MIME-Version: 1.0" . "\r\n";
$headers .= "Content-type: text/html; charset=iso-8859-1" . "\r\n";
$headers .= "From: successive.testing@gmail.com" . "\r\n" .
"Reply-To: successive.testing@gmail.com" . "\r\n" .
"X-Mailer: PHP/" . phpversion();

For a few reasons.

One of which is the need of a Reply-To and,
The use of apostrophes instead of double-quotes. Those two things in my experience with forms, is usually what triggers a message ending up in the Spam box.

You could also try changing the $from to: