Shoutbox

I'm using this code, I just change the Headers, and stop working. Can someone help me figuring out what happen?, thank you very much.

    mail($email_address, $subject, $message,
        "From: Leonel Galán<leonelgalan@mysite.com>\r\n"
    ."Reply-To: leonelgalan@anothersite.com\r\n"
    ."X-Mailer: PHP/" . phpversion());

I add the headers, because my mail was treated as SPAM by some mailfilters, so I thought headers could help.