When you set up a new email account there are several user attributes you can assign to that particular account. The following is a list of those options and what they mean.

User cannot change password. Select this option to prevent the user from changing their password remotely.

Account access disabled. Select this option to prohibit the user from accessing the account remotely through POP3 or IMAP4. This option allows you disable the account without changing the user's password or removing them from the system.

Hide from information services. Select this option to prevent the distribution of any information about this user through Finger, LDAP, or Whois if you have the Finger, LDAP, or Whois servers running.

Enable Spell Checking. Enables spell checking for users. This is available on the Compose, Reply-to, Forward and Draft pages.

Host Administrator. Select this option if you want this user to add, modify, or delete users and aliases on their mail host by using the Remote Administration utility, the Web Remote Administration utility, or web mail WebMail. To use the web utilities, Allow Web Access must also be selected.

Allow Web Access. Select this option to allow this user to access their account via the Web Remote Administration utility (provided the utility is configured) and web mail WebMail.

List Administrator. Select this option if you want this user to add, modify, or delete list server mailing lists.

User cannot modify LDAP attributes. Select this option to prohibit the user from modifying their LDAP attributes (name, address, organization, etc.).

Enable Calendaring. Allows the user to access the calendar by clicking the Calendar icon. The Calendar icon is not displayed in the toolbar unless this option is selected.

System Administrator. Select this option to allow this user access to all functions provided by the Remote Administration utility, the Web Remote Administration utility, or web mail -- including the creation and administration of virtual hosts. To use the web utilities, Allow Web Access must also be selected.

Here are some further notes on some of those options listed above:

Hide from information services.
Information services is not enabled on our mailservers, so this option is a moot point.

Enable Spell Checking.
Spell checking also has to be enabled on the server side; to do so send an emailed request to support@hostmysite.com

List Administrator.
This option isn't available unless you sign up for one of our List Server plans
(please contact support@hostmysite.com for more information)

User cannot modify LDAP attributes.
Again, this service isn't used so it's a moot issue.

System Administrator.
Clients will not be able to access this feature as it gives the rights to create new accounts and domains on the server.