To chroot or not to chroot?

[Martín Villalba <famafcs () gmail com>]

Hi, list! Maybe you can help me with this: I'm about to install a
webserver, which should have an http server, webmail, php support,
dns, ftp, remote login and a couple more things. Obviously, with all
those ports open, I must take every security measure I know (and some
I don't). But here comes my doubt: should I jail the webserver with
chroot? My first thought was "Duh, yes!", but thinking about it,
having all those services running at the same time, do I really make
any difference? It seems to me that in such environment a cracker (no,
i'm not writing "hacker") could do anything he (maybe she?) wants...
Ideas? Suggestions? Donations (cash, please)?
C-you

Martín