<?php
 
 
    // if form is submitted
    if($_POST['submit'])
    {
        $sender = "From: " . $field_1 . " <" . $field_2 . ">";
         // if you are using these values to add into a database as well, you may want some more security!
          foreach($_POST as $key => $value)
             $$key = htmlspecialchars($value);
     
          // required fields
          if($field_1 != '' && $field_2 != '' && $field_3 != '' && $field_4 != '')
          {
            $message_body .=  $field_1 . ' <' . $field_2 . ' > ' . ' wrote the following message: ' . "\r\n";
            $message_body .= 'Comments: '. $field_4 . "\r\n";
     
            // send mail
            //mail($to_email, 'Contact - ' . $field_3, $message_body);
            mail("info@mydomain.org", $field_3, $message_body, $sender);
            $msg = '<p>We have received your information. We will try and answer your question or comments ASAP.</p>';
            $msg .= '<p>Thank you.</p><p><b>You wrote the following:</b>';
            $msg .= '<div class="followup">';
            $msg .= '<p><b>Full Name:</b> '. $field_1 .'</p>';
            $msg .= '<p><b>Email</b>: ' . $field_2 . '</p>';
            $msg .= '<p><b>Subject</b>: ' . $field_3 . '</p>';
            $msg .= '<p><b>Comments:</b><br /> ' . $field_4 . '</p>';
            $msg .= '</div>';
          }
          // if a required field wasn't filled in
          else
            $error = '<p class="error">Please make sure all fields are filled in.</p>';
    }
 
     if(isset($msg))
         echo $msg;
         
     else
     {
         if(isset($error))
             echo $error;
 ?>