php-send.php

<form class="contactform" method="post" action="testimonials">
                    <div class="contactform">
                       
                                <input type="text" name="name" placeholder="YOUR NAME">
                            
                                <input type="email" name="email" placeholder="YOUR EMAIL">
                    
                                <input type="text" name="subject" placeholder="YOUR SUBJECT">
                         
                                <textarea name="message" placeholder="YOUR MESSAGE"></textarea>
                                <button type="submit" class="button">
                                    <span class="button-text">Send Message</span>
                                    <span class="button-icon fa fa-send"></span>
                                </button>
                            
                                <span class="output_message text-center font-weight-600 text-uppercase"></spa
                </form>



<?php
if (isset($_REQUEST['name'],$_REQUEST['email'])) {
      
    $name = $_REQUEST['name'];
    $mail = $_REQUEST['email'];
    $subject = $_REQUEST['subject'];
    $message = $_REQUEST['message'];
      
    // Set your email address where you want to receive emails. 
    $to = 'yourmail@mail.com';

    $headers = "From: ".$name." <".$mail."> \r\n";
      
    $send_email = mail($to,$subject,$message,$headers);
      
    echo ($send_email) ? 'success' : 'error';
      
}
?>