debugging sendmail php

debugging_sendmail.txt

/usr/local/bin/phpsendmail
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#!/usr/local/bin/php
<?php

/**
  This script is a sendmail wrapper for php to log calls of the php mail() function.
  Author: Till Brehm, www.ispconfig.org
  (Hopefully) secured by David Goodwin <david @ _palepurple_.co.uk>
*/

$sendmail_bin = '/usr/sbin/sendmail';
$logfile = '/tmp/mail_php.log';

//* Get the email content
$logline = '';
$pointer = fopen('php://stdin', 'r');

while ($line = fgets($pointer)) {
        if(preg_match('/^to:/i', $line) || preg_match('/^from:/i', $line)) {
                $logline .= trim($line).' ';
        }
        $mail .= $line;
}

//* compose the sendmail command
$command = 'echo ' . escapeshellarg($mail) . ' | '.$sendmail_bin.' -t -i';
for ($i = 1; $i < $_SERVER['argc']; $i++) {
        $command .= escapeshellarg($_SERVER['argv'][$i]).' ';
}


//* Write the log
file_put_contents($logfile, date('Y-m-d H:i:s') . ' ' . $_ENV['PWD'] . ' ' . $logline.' '.getenv('__PATH_INFO').' '.getenv('__SCRIPT_NAME').' '.getenv('__SCRIPT_FILENAME')."\n", FILE_APPEND);
//* Execute the command
return shell_exec($command);
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nginx host config
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fastcgi_param  PHP_VALUE   "auto_prepend_file=/home/xxxxxxx/htdocs/set_php_headers.php";
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set_php_headers.php
<?php
putenv("__PATH_INFO=". $_SERVER["PATH_INFO"]);
putenv("__SCRIPT_NAME=". $_SERVER["SCRIPT_NAME"]);
putenv("__SCRIPT_FILENAME=". $_SERVER["SCRIPT_FILENAME"]);
putenv("__REMOTE_ADDR=". $_SERVER["REMOTE_ADDR"]);
putenv("__HTTP_HOST=". $_SERVER["HTTP_HOST"]);
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php.ini
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[mail function]
sendmail_path = /usr/local/bin/phpsendmail
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