[SOLVED] sending email via php mail function goes to spam

sending email via php mail function goes to spam

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 you please figure out whats the problem?

Solution

The problem is simple that the PHP-Mail function is not using a well configured SMTP Server.

Nowadays Email-Clients and Servers perform massive checks on the emails sending server, like Reverse-DNS-Lookups, Graylisting and whatevs. All this tests will fail with the php mail() function. If you are using a dynamic ip, its even worse.

Use the PHPMailer-Class and configure it to use smtp-auth along with a well configured, dedicated SMTP Server (either a local one, or a remote one) and your problems are gone.

https://github.com/PHPMailer/PHPMailer