/**
* init will setup static values for sender, recipients, message text, and reply to
* <br> if isStatic() returns true
* it calls getSender(), getReplyTo(), getMessage(), and getRecipients() and getTo()
*
*/
    public void init() throws MessagingException {
        log("redirect init");
        if(isStatic()){
            sender      =  getSender()==null ? getMailetContext().getPostmaster():getSender();
            replyTo     =  getReplyTo()==null ? getMailetContext().getPostmaster():getReplyTo();
            messageText =  getMessage();
            recipients  =  getRecipients(sender);//CHANGED (if static, then normally you put an address in the config.xml - here "sender" is
						//		just a "DUMMY")					
            apparentlyTo = getTo();
            log("static, sender="+sender+", replyTo="+replyTo+", message="+messageText+" ");
        }

    }


/**
*
* Service does the hard work,and redirects the mail in the form specified
*
*
*/

    public void service(Mail mail) throws MessagingException {
        if(!isStatic()){
            sender      =  getSender();
            replyTo     =  getReplyTo();
            messageText =  getMessage();
            recipients  =  getRecipients(mail.getSender()); //CHANGED!!!!!!!!!!!!
            apparentlyTo = getTo();
            log("dynamic, sender="+sender+", recipients="+recipients+"  ,message="+messageText+" ");
        }

....

continue at 'getRecipients(MailAddress mailAddr)

public Collection getRecipients(MailAddress mailAddr){
        Collection newRecipients = new HashSet();
        String addressList = getInitParameter("recipients")==null? getInitParameter("to"):getInitParameter("recipients");
        
// I put 'senderAddress' in the config.xml at <recipients> (just take a word you prefer)
// So, if it equals then take the Senderaddress and add it to <recipients>
	if(addressList.equals("senderAddress")) {
            newRecipients.add(mailAddr);
        }

        else {
           StringTokenizer st = new StringTokenizer(addressList, ",", false);
           while (st.hasMoreTokens()) {
              try{
                  newRecipients.add(new MailAddress(st.nextToken()));
              }catch(Exception e){
                  log("add recipient failed in getRecipients");
              }
          }
        }

        return newRecipients;
    }


of course i had to change getTo() too:
since I donīt use the <to>-Tag the config.xml, I didnīt made much changes as you can see below!

    public InternetAddress[] getTo(){
        InternetAddress[] iaarray = null;
        String addressList = getInitParameter("to")==null? getInitParameter("recipients"):getInitParameter("to");
        if(addressList == null) {
            return iaarray;
        }
        else {
            StringTokenizer rec = new StringTokenizer(addressList,",") ;
            int tokensn = rec.countTokens();
            iaarray = new InternetAddress[tokensn];
            String tokenx ="";
            for( int i=0;i<tokensn;++i){
                try{
                    tokenx=rec.nextToken();
                    iaarray[i]=new InternetAddress(tokenx);
                }catch(Exception e){
                    log("Internet address exception in getTo()");
               }
            }
            return iaarray;
        }


    }