Adding features to a mailinglist

Hello *, I run the Courier Mailing List Manager with currently 173 lists and a bunch of domains just fine. Now I like to add a List Archive which allow users to sort by THREAD, SUBJECT and DATE and also allow to reply to a post (with previous registering, but no captcha crap) It should work without AJAX and DRUPAL because I have again discovered a mess using it and I am absolutely not more willing to use it again. It is to complex and eating up to much resources. The second FEATURE I like to add is a FORUM. I have written a small PHP5 script, which use IMAP to access the mailfolder of the List and create from the SUBJECTS a DATE sorted list. I think, most of you know, how a forum look like. If I click on a subject, it opens the topic with all the messages in this topic. Later I will add also the body of the message. However, this @#!@ fails, is stupid users take an old message from the mailinglist, change the subject and post it as new topic. Any suggestions, how to handle this two cases? Thanks in avance Michelle -- Michelle Konzack Miila ITSystems @ TDnet GNU/Linux Developer 00372-54541400