PHP with qmail

I have a customer using YaBB (a PHP-based message board) on a server that uses qmail. From what I've heard from her and the YaBB people and the PHP manual, PHP only supports sendmail or SMTP on Windows. This means, if I understand correctly, that I can choose between sendmail (unacceptable) and Windows (*very* unacceptable). How can I use the mail() function with qmail on linux/unix? They're currently calling qmail's sendmail binary, but the return-path header is always wrong, since qmail needs the sendmail binary to be called with -f<return_address> for it to be set. -- Casey Allen Shobe cshobe@softhome.net 'Why do people with closed minds always open their mouths?'