write mails to files

#!/usr/bin/env php
<?php
$dir = "/tmp/phpmails";
if (!is_dir($dir)) {
  mkdir($dir);
}
$input = file_get_contents('php://stdin');
preg_match('|^To: (.*)|', $input, $matches);
$filename = isset($matches[1]) ? $matches[1] . '_' : 'no-recepient_';
$t = tempnam($dir, $filename);
file_put_contents($t, $input);