Checkout Freshmeat.net.  I think I see updates to at least one or two different
PHP based web email packages a week.

> I am looking ahead knowing that I am going to need a http based server for
> internet mail where the actual pop3/imap/actually Groupwise server will be
> behind a firewall. I have been playing with several perl based setups none
> entirely complete and the one I like best so far requires the mail server to
> be on the localhost and not a remote host. Seems that more development is
> centered on php based systems.
> 
> So my questions are:
> 
> anybody using a GPL style perl or PHP based http mail server with success?
> Support SSL? How about commercial based software that works (though this is
> poorly funded non-profit).