Code:
<?php 
# You can use this script to submit your forms or to receive orders by email.
$MailToAddress = "blabla@blabla.de"; // your email address
$redirectURL = "blabla.de"; // the URL of the thank you page.
$MailSubject = "Boss is back ya"; // the subject of the email
$sendHTML = FALSE; //set to "false" to receive Plain TEXT e-mail
$serverCheck = TRUE; // if, for some reason you can't send e-mails, set this to "false"

# copyright 2006 Web4Future.com =================== READ THIS ===================================================

# If you are asking for a name and an email address in your form, you can name the input fields "name" and "email".
# If you do this, the message will apear to come from that email address and you can simply click the reply button to answer it.

# To block an IP, simply add it to the blockip.txt text file.
# CHMOD 777 the blockip.txt file (run "CHMOD 777 blockip.txt", without the double quotes) 
# This is needed because the script tries to block the IP that tried to hack it

# If you have a multiple selection box or multiple checkboxes, you MUST name the multiple list box or checkbox as "name[]" instead of just "name" 
# you must also add "multiple" at the end of the tag like this: <select name="myselectname[]" multiple> 
# you have to do the same with checkboxes

/*****************************************************************

    Web4Future Easiest Form2Mail (GPL).
    Copyright (C) 1998-2006 Web4Future.com All Rights Reserved. 
    http://www.Web4Future.com/
    This script was written by George L. & Calin S. from Web4Future.com

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

*****************************************************************/

# DO NOT EDIT BELOW THIS LINE UNLESS YOU KNOW WHAT YOU ARE DOING ===================================================
$w4fver =  "2.2";
$ip = ($_SERVER['HTTP_X_FORWARDED_FOR'] == "" ? $_SERVER['REMOTE_ADDR'] : $_SERVER['HTTP_X_FORWARDED_FOR']);
//function blockIP
function blockip($ip) {
    $handle = @fopen("blockip.txt", 'a');
    @fwrite($handle, $ip."\n");
    @fclose($handle); 
}
$w4fx = stristr(file_get_contents('blockip.txt'),getenv('REMOTE_ADDR')); 
if ($serverCheck) { 
    if (preg_match ("/".str_replace("www.", "", $_SERVER["SERVER_NAME"])."/i", $_SERVER["HTTP_REFERER"])) { $w4fy = TRUE; } else { $w4fy = FALSE; }
} else { $w4fy = TRUE; }
if (($w4fy === TRUE) && ($w4fx === FALSE)) {
$w4fMessage = "<!DOCTYPE HTML PUBLIC \"-//W3C//DTD HTML 4.01 Transitional//EN\" \"http://www.w3.org/TR/html4/loose.dtd\"><html>\n<head><meta http-equiv=\"Content-Type\" content=\"text/html; charset=iso-8859-1\"></head><body><font face=3Dverdana size=3D2>";
if (count($_GET) >0) {
    reset($_GET);
    while(list($key, $val) = each($_GET)) {
        $GLOBALS[$key] = $val;
        if (is_array($val)) { 
            $w4fMessage .= "<b>$key:</b> ";
            foreach ($val as $vala) { 
                $vala =stripslashes($vala);
                $vala = htmlspecialchars($vala);
                if (trim($vala)) { if (stristr($vala,"Content-Type:") || stristr($vala,"MIME-Version") || stristr($vala,"Content-Transfer-Encoding") || stristr($vala,"bcc:")) { blockip($ip); die("ILLEGAL EXECUTION DETECTED!"); }    }
                $w4fMessage .= "$vala, ";
            } 
            $w4fMessage .= "<br>\n";
        }     
        else {
            $val = stripslashes($val);
            if (trim($val)) { if (stristr($val,"Content-Type:") || stristr($val,"MIME-Version") || stristr($val,"Content-Transfer-Encoding") || stristr($val,"bcc:")) { blockip($ip); die("ILLEGAL EXECUTION DETECTED!"); }    }
            if (($key == "Submit") || ($key == "submit")) { }     
            else {     if ($val == "") { $w4fMessage .= "$key: - <br>\n"; }
                    else { $w4fMessage .= "<b>$key:</b> $val<br>\n"; }
            }
        }
    } // end while
}//end if
else {
    reset($_POST);
    while(list($key, $val) = each($_POST)) {
        $GLOBALS[$key] = $val;
        if (is_array($val)) { 
            $w4fMessage .= "<b>$key:</b> ";
            foreach ($val as $vala) { 
                $vala =stripslashes($vala);
                $vala = htmlspecialchars($vala);
                if (trim($vala)) { if (stristr($vala,"Content-Type:") || stristr($vala,"MIME-Version") || stristr($vala,"Content-Transfer-Encoding") || stristr($vala,"bcc:")) {blockip($ip); die("ILLEGAL EXECUTION DETECTED!"); }    }                
                $w4fMessage .= "$vala, ";
            } 
            $w4fMessage .= "<br>\n";
        }     
        else {
            $val = stripslashes($val);
            if (trim($val)) { if (stristr($val,"Content-Type:") || stristr($val,"MIME-Version") || stristr($val,"Content-Transfer-Encoding") || stristr($val,"bcc:")) {blockip($ip); die("ILLEGAL EXECUTION DETECTED!"); }    }
            if (($key == "Submit") || ($key == "submit")) { }     
            else {     if ($val == "") { $w4fMessage .= "$key: - <br>\n"; }
                    else { $w4fMessage .= "<b>$key:</b> $val<br>\n"; }
            }
        }
    } // end while
    }//end else
    $w4fMessage .= "<font size=3D1><br><br>\n Sender IP: ".$ip."</font></font></body></html>";
    $w4f_what = array("/To:/i", "/Cc:/i", "/Bcc:/i","/Content-Type:/i","/\n/");
    $name = preg_replace($w4f_what, "", $name);
    $email = preg_replace($w4f_what, "", $email);
if (!$email) {$email = $MailToAddress;}
    $mailHeader = "From: $name <$email>\r\n";
    $mailHeader .= "Reply-To: $name <$email>\r\n";
    $mailHeader .= "Message-ID: <". md5(rand()."".time()) ."@". ereg_replace("www.","",$_SERVER["SERVER_NAME"]) .">\r\n";
    $mailHeader .= "MIME-Version: 1.0\r\n";
    if ($sendHTML) {
        $mailHeader .= "Content-Type: multipart/alternative;";            
        $mailHeader .= "     boundary=\"----=_NextPart_000_000E_01C5256B.0AEFE730\"\r\n";                    
    }
    $mailHeader .= "X-Priority: 3\r\n";
    $mailHeader .= "X-Mailer: PHP/" . phpversion()."\r\n";
    $mailHeader .= "X-MimeOLE: Produced By Web4Future Easiest Form2Mail $w4fver\r\n";
    if ($sendHTML) { 
        $mailMessage = "This is a multi-part message in MIME format.\r\n\r\n"; 
        $mailMessage .= "------=_NextPart_000_000E_01C5256B.0AEFE730\r\n";
        $mailMessage .= "Content-Type: text/plain;   charset=\"ISO-8859-1\"\r\nContent-Transfer-Encoding: quoted-printable\r\n\r\n";            
        $mailMessage .= trim(strip_tags($w4fMessage))."\r\n\r\n";            
        $mailMessage .= "------=_NextPart_000_000E_01C5256B.0AEFE730\r\n";            
        $mailMessage .= "Content-Type: text/html;   charset=\"ISO-8859-1\"\r\nContent-Transfer-Encoding: quoted-printable\r\n\r\n";            
        $mailMessage .= "$w4fMessage\r\n\r\n";            
        $mailMessage .= "------=_NextPart_000_000E_01C5256B.0AEFE730--\r\n";            
    }
    if ($sendHTML === FALSE) {
        $mailHeader .= "Content-Type: text/plain;   charset=\"ISO-8859-1\"\r\nContent-Transfer-Encoding: quoted-printable\r\n\r\n";            
        $mailMessage .= trim(strip_tags($w4fMessage))."\r\n\r\n";            
    }

    if (!mail($MailToAddress, $MailSubject, $mailMessage,$mailHeader)) { echo "Error sending e-mail!";}
    else { header("Location: ".$redirectURL); }    
} else { echo "<center><font face=verdana size=3 color=red><b>ILLEGAL EXECUTION DETECTED!</b></font></center>";}
?>
Dieses Formular funktioniert komischerweise nicht....seht Ihr einen Fehler?
Es funktioniert in dem Sinne nicht, dass keine Email ankommt...