Looking for security tips about webhosting app

We want to use an XServe for hosting some of our clients' websites. These should have web and ftp services only (maybe webmail) as well as able to install their own CGIs (or run ours).
So far (and with the help of the forum here I managed to set up the server. However before taking over the first websites, I generally wanted to know if there are any security issues to consider when intending such an application.
So some things I'm still unsure with when setting up a user regarding security:
(1)
Each user I create is automatically assigned to the group 20 (shortname "staff"). Should I made any changes here ? Must the user be part of other groups ?
(2)
Should I set the login shell for these users to "none" or doesn't it play a role ?
(3)
Which application has the "Info" section for each user at the WGM ? Is it just for information ?
(4)
How can I prevent a user logging in to the server by telnet or ssh ? Currently I have configured our router to block traffic on ports 22 and 23 and this works quite well. But isn't there a more radical solution (beside disabling these ports in the server firewall) ?
Any other advise or security tips for protecting the server is welcome and appreciated.

1. I would probably set it up so each of your clients has it's own group.
Although, I don't know the specifics of your setup.
Why is this recommended seen security aspects ?
Users have only access by ftp/mail services, anything else is disabled.
2. A shell is required for FTP access. So unfortunatly this is not an option.
Strange that Apple likes to give each user that requires ftp also shell access in the way that they can log in via terminal - or is their command set limited to only viewing files, creating directories and changing permissions ?
Anyway, since we disabled the ports for ssh in our router I think that we are on the safe side here. Or can you think of a tricky user that finds a way to work around this ? I don't think, but better asking the experts before a hacker shows that it is possible
4. The info tab in WGM is to populate the associated fields in the LDAP DB.
Okay, then we leave this out, since users have not access to the server in a way that they can use the address book.
May I add another question:
How safe is it to enable the webmail feature for users ? Are there any known bugs or security holes ?

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