From address wont come up when sending an email

[jwk811]

using this script

<?php
$to = "(to email)";
$subject = "My subject";
$txt = "Hello world!";
$headers = "From: (from emai)" . "\r\n" .
mail($to,$subject,$txt,$headers);
?>

in the email the from address is my server.. it was actually working before but now its not, whats wrong?

[jwk811]

nevermind i got it.. thats insane though.. like this anyone can send emails to anyone and having it appear as coming from anyone you'd like... that seems messed up