root@knoppbox:~# /etc/init.d/apache start
Starting web server: apache[Thu Sep 23 23:19:11 2004] [warn] module ssl_module is already loaded, skipping
failed
I believed it has something to do with your httpd.conf, please check, maybe your path is wrong, maybe your virtual host.

I'm using kanotix, it comes with ftpd as ftp server. I think knoppix do comes with it to. Try : locate ftpd. A good one, I don't know.

Knoppix comes with smail. But I never use it. It's too complicated. I used xmail as my smtp/pop3 server.Plenty of filter to use. It's very good and easy to setup, plus they have good forum like this one.
xmailserver.org/
This is a good guide how to setup xmail;
http://www.ubaight.com/xmail/BeginnersGuide.html

For webmail, I use uebimiau, php based imap/pop.
http://www.uebimiau.org/