To create a reseller plan:
The option When limit on usage of a resource is reached, send email according to server notification settings triggers sending notifications to users and/or e-mail addresses specified at Settings > Notifications: Resource usage limits exceeded by subscription option.
Note: The overuse policy does not apply to the limits set on size of mailboxes. Therefore, even if you enable overuse, be sure to allocate enough disk space to mailboxes.
If overselling is allowed, a reseller is governed by actual resource usage instead of initial resource allocation. Overselling is a marketing strategy based on the following scheme: a reseller, who was allotted, for example, ten gigabytes of disk space, allocates five gigabytes of disk space for each of their customers, assuming that none of them will actually use all of their allocated disk space.
httpdocs folder. Please note that selecting this option might seriously compromise the websites security.