I'm about to start work on a custom webmail system for a client. I
built a similar system a few years ago by hacking apart SquirrelMail
(http://www.squirrelmail.org/), which was the best option at the time.
I've been looking at other options but there are quite a lot of
products to sift through and time is not on my side.
Is there a better customisable PHP webmail system than Squirrel Mail
which supports folders, contacts, etc?