hide header in mail() output?

[botanist]

When I create a custom header name and send it with the mail() function, that header remains visible for the recipient. I would like to send a hidden header, well, one that only shows up when the receiver presses the 'BlahBlah' button in Eudora. How-to?

Thanks, Marco

[webnick]

Eudora? your headers should not be visible to the client. they are interpeted by a browser (or whatever) to help decide what to do with the data the server is pumping. HTML header info @: http://www.w3.org/Protocols/rfc2616/rfc2616-sec4.html#sec4.2

So, like, an example php header would be at the very top of your php file, with no blank lines before it.

<?php
header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
header("Cache-Control: no-cache");
header("Cache-Control: post-check=0,pre-check=0");
header("Cache-Control: max-age=0");
header("Pragma: no-cache");
?>