使用Codeigniter发送到垃圾邮件文件夹而不是收件箱的电子邮件[复制]

I am developing an e-commerce system. My e-commerce system is up in my hosting called zoom. I am done in the part of ordering and right now, I'm having difficulty in sending the email.

It is working but it goes in the spam folder instead of inbox.

NOTE: I already created an email account in my hosting zoom and I used it in my code(you can see below)

Question: I want to send the email without being labeled as spam. Is there something missing or wrong in my code? Please point me towards right direction.

Controller

 public function process()
    {         
        $id = $this->session->userdata('id');
        $where = array('id' => $id);
        $get_orders  = $this->Crud_model->join_orders_customer('*','orders',$id);
        $get_invoice = $this->Crud_model->get_invoice('*','orders',$id);

        $email = $this->Crud_model->get_email($id);

        $config = array(
                    'smtp_timeout' => '4',
                    'charset' => 'utf-8',
                    'mailtype'=> 'html'
                    );
                    $this->load->initialize($config);
                    $fromemail="zeesdelivery@zessdelivery.com";
                    $to = $email->email_address;
                    $subject = "Your Order is not Processing";
                    foreach($get_orders as $row){
                     $mesg = "<h1>Schedule Accepted!!!</h1> 

                            <h3>Thank you for trusting and using Exclure Pest Control. $row->product_name</h3> 
                            <h3>Your reserve inspection is accepted. We sure to call you as soon as possible</h3>
                            <p>--------------------------------------------------------------------------------------</p>
                            <h4>For more details contact us at,</h4>
                            <h4>Exclure Pest Control</h4>    
                            <h4>Email : exclure@exclure.com.ph</h4>
                            <h4>Contact Number: 525-5399/ 498-1626 </h4>              
                            <h4>Facebook : https://web.facebook.com/ExclurePestControl/</h4>";
                    }

                   $this->load->library('email');
                    $this->email->clear();
                    $this->email->from($fromemail, 'Zees Delivery');
                    $this->email->to($to);
                    $this->email->set_header('Header1', 'Value1');
                    $this->email->set_newline("
");
                    $this->email->subject($subject);
                    $this->email->message($mesg);
                    $this->email->set_mailtype('html');
                    $this->email->send();
                    $this->cart->destroy();
                    echo json_encode("success");
            }
</div>

I am assuming you are checking in gmail where the email is flagged as spam.

Email clients/servers flag emails as spam based on the content and domain names.

There should not be any technical reason for the email to land in spam folder, the reason is more to do with content and email address domain.