sendmail_local.php

<?php

/**
 * This script allows to redirect mail sent via the php mail function
 * to a dedicated mailbox
 *
 * @date   2013-06-20
 * @author Sébastien MALOT / Actualys
 * 
 * ----------------------------------
 * 
 * In PHP (apache et cli)
 * 
 * sendmail_path = "php /path_to/sendmail_local.php | sendmail -t -i"
 * 
 * ----------------------------------
 * 
 * In Apache/VirtualHost
 * 
 * <VirtualHost *:80 >
 *   ...
 *   php_admin_value sendmail_path "php /path_to/sendmail_local.php | sendmail -t -i"
 *   ...
 * </VirtualHost>
 * 
 */

$to = '[email protected]';

$content = file_get_contents('php://stdin');

// debug
//file_put_contents('/tmp/mail.log', $content, FILE_APPEND);

// EOL character detection
$pos       = strpos($content, "\n");
$separator = "\n";
if (substr($content, $pos + 1, 1) == "\r") $separator .= "\r";
if (substr($content, $pos - 1, 1) == "\r") $separator = "\r" . $separator;

// split between header and body
$parts = preg_split('/' . $separator . $separator . '/', $content);
$headers = array_shift($parts);
$body = implode($separator . $separator, $parts);

// headers extraction
$matches = array();
preg_match_all('/(?P<type>.*?):\s*(?P<value>.*?\n(\s.*?\n)*)/', $headers . $separator, $matches);
$headers = array();

$typesToStrip = array('to', 'cc', 'bcc');

foreach ($matches['type'] as $key => $type) {
    $value = rtrim(preg_replace('/' . preg_quote($separator) . '\s+/m', ' ', $matches['value'][$key]));

    if (in_array(strtolower($type), $typesToStrip)) {
        $headers['X-Original-' . $type] = $value;
    } else {
        $headers[$type] = $value;
    }
}

// header reconstruction
$headers['To'] = $to;
$bloc = array();

foreach ($headers as $type => $value) {
    $bloc[] = $type . ': ' . $value;
}

// output for sendmail handling
echo implode($separator, $bloc) . $separator . $separator . $body;