How to test if PHP mail() has successfully delivered mail

Question

How can I test if mail() has successfully delivered mail?

Answer 1

if (isset($_POST["btn_emp"])) {

//$hid_emp = ($_POST['hid_emp']);
$employee_name = ($_POST['employee_name']);
$department_id = ($_POST['department_id']);
$serial_number = ($_POST['serial_number']);
$employee_address = ($_POST['employee_address']);
$employee_contact = ($_POST['employee_contact']);
$employee_email = ($_POST['employee_email']);





$insert = "INSERT INTO tbl_employee(department_id,serial_number,employee_name,employee_address,employee_contact,employee_email)VALUES('$department_id', '$serial_number', '$employee_name','$employee_address' ,'$employee_contact', '$employee_email')";
//echo $insert;
//die();
if ($conn->query($insert) === TRUE) {
    //CODE FOR SEND MAIL
    $Mail_Admin_Message = '';
            $Mail_Admin_Message .= '
                


                    

                    

                        

                            Date : '. $serial_number .'
                        
                    
                    

                    

                        

                            Hi  '. $employee_name .'
                        
                    
                    

                    

                        

                          Your Gift Voucher Code is : '. $department_id .'
                        
                    
                    

                    

                        

                            Gift Amount : '. $employee_address .'
                        
                    
                    

                    

                    

                        
Thanks, 
DairyKart Team
                    
                
';

            $Mail_To_Admin_ID   = $employee_email;
            $Mail_Admin_Subject = "Employee Details";
            $Mail_Admin_Header  = "MIME-Version: 1.0\n";
            $Mail_Admin_Header .= "Content-type: text/html; charset=iso-8859-1\r\n";
            $Mail_Admin_Header .= "Content-Transfer-Encoding: 8bit\n";
            $Mail_Admin_Header .= "X-Priority: 1\n";
            $Mail_Admin_Header .= "From: Employee-Department Project\r\n";
            $Mail_Admin_Header .= "X-MSMail-Priority: High\n";
            mail($Mail_To_Admin_ID, $Mail_Admin_Subject, $Mail_Admin_Message, $Mail_Admin_Header);
            //echo $serial_number;
            //echo $employee_email;
            //die();
    echo "";