[PATCH] Add information header to mail() View as Markdown

This is a patch to add an informational header to messages sent from PHP
via the mail() function. This can help to track which script on a server
was used to send a message, and which client caused it to be sent.

The header added has the form:
X-PHP-Script: <servername><php-self> for <remote-addr>
For example:
X-PHP-Script: www.example.com/~user/testapp/send-mail.php for
10.0.0.1

http://www.lancs.ac.uk/~steveb/php-mail-header-patch/

Steve.