Mail() "problem"

Hi list, Has anyone ever tried to use "REMOTE_ADDR" to be sent along with emails sent from php-scripts that use the "mail()" function? I have built a small auto-relaying sendmail (crudely based on mini-sendmail, http://www.acme.com/software/mini_sendmail/) that adds a "received" header containing the poster's ip-address. Unfortunately php does NOT pass on these environment variabeles to the program that gets called as the mail-program (In my case my mini-sendmail). This renders this little "spamfinder" trick unusable, which is too bad :( If someone has a clue/trick for me on how to enable this, I would be really gratefull! Kind regards, Maikel Verheijen.