ZCS Administrator Guide 8.0

Open Source Edition

Managing Accounts Usage with a COS

A default COS is created when Zimbra is installed. You can modify the default COS and create new ones.

You can manage the following from a COS.

Features and preferences that users can access

Themes and Zimlets that users can access

Advanced settings including attachment settings, quotas, and password log in policies

Retention policies

Mobile access

You could, for example, create an Executive COS which is configured to enable all features, have unlimited mailbox quotas and never purges messages and create another General-Employee COS which enables only the mail feature, sets the mailbox quota and purges messages every 60 days. Grouping accounts to a specific COS lets you update or change account features in block. When the COS is changed all accounts assigned to the COS are changed.

If a COS is not explicitly set for a new account, or if the COS assigned to a user no longer exists, the Zimbra default COS is automatically assigned.

You can create a domain COS and have all accounts created on that domain automatically be assigned this COS. You can create different COSs and specify which ones are available for the domain. If a domain does not have a COS defined, and you do not specify a COS, the original default COS is automatically assigned when an account is created.

Some COS settings can be overridden either by global settings or by user settings. For example:

Whether outgoing messages are saved to Sent can be changed from the Zimbra Web Client in the user’s preferences.

Attachment blocking set as a global setting can override the COS setting.

Note:

Some COS settings assigned to an account are not enforced for IMAP clients.