Having an issue using mailer.php

I'm currently using a mailer.php file for a minimal contact form

However I have noticed recently then when submitting the form, I am getting the following error;

HTTP Error 405.0 - Method Not Allowed The page you are looking for cannot be displayed because an invalid method (HTTP verb) is being used.

My mailer.php file is the following

<?php $email_to = "[email protected]"; $name = $_POST["name"]; $email_from = $_POST["[email protected]"]; $message = $_POST["message"]; $email_subject = "Feedback from website"; $headers = "From: " . $email_from . "\n"; $headers .= "Reply-To: " . $email_from . "\n"; $message = "Name: ". $name . "\r\nMessage: " . $message; ini_set("sendmail_from", $email_from); $sent = mail($email_to, $email_subject, $message, $headers, "-f" .$email_from); if ($sent) { header("Location: "); } else { echo "There has been an error sending your message. Please try later."; } ?> 

The form using this file has the following form tag

<form method="post" action="mailer.php"> 

PHP is not my strong point so I'm not sure why this maybe happening. The form itself does not have a captcha field. Could spam be the root of the issue?

I'd appreciate anyone who can shed this light on this for me

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