Mail shizz

------------master.cf----------------------------

smtp      inet  n       -       -       -       -       smtpd
    -o content_filter=myhook:dummy

# (At bottom)
myhook unix - n n - - pipe
  flags=F user=www-data argv=/hsp/mail.php

-------------------------------------------------

------------mail.php-----------------------------
#!/usr/bin/php
<?php

$file = @ fopen("/hsp/test.txt","a");
fwrite($file, "Message received!");
fclose($file);

?>
-------------------------------------------------

---------mail.log--------------------------------
Feb 18 13:33:09 horus postfix/pipe[6194]: 3FB3B12006C: to=<n0bane@localhost>, relay=myhook, delay=0.11, delays=0.07/0.01/0/0.03, dsn=2.0.0, status=sent (delivered via myhook service)
Feb 18 13:33:09 horus postfix/qmgr[6172]: 3FB3B12006C: removed
-------------------------------------------------