To change the disk quota limit default for domains in smartermail on your dedicated server, please log in as the administrator.

Click on Settings > click on Default Domain Settings

From here you can change the disk quota default for domains within smartermail.

If you want to change the quota of an idividual's domain, pelase click on Manage > manage domains

From here clcik on the Actions for individual domain you want to change the quota for, then click on Edit Domain

From here click limits, and change the quota as in the earlier default domain example in this article.