vpopmail extensions ?

hello, i'm in need off managing a web site and i need to authenticate the users on the web site using their email/passwd adress. The mail server is using qmail & vpopmail, vpopmail is compiled with mysql option, so i have the choice between managing myself the passwords to compare it with the encrypted password in the vpopmail database, OR use the new vpopmail extensions in PHP. I found that in the PHP changelog : New extension for vpopmail - http://www.inter7.com/vpopmail, give it a try, but keep in mind that it is not ready for production environments. (David Croft, Boian Bonev) but i can't find anything in the documentation ... where are those extensions please ? what are the available functions ? thank you Arnauld Dravet smurfie@nerim.fr