How much disk storage does ISMail require?
The amount of disk storage greatly depends on the amount of mail stored on the system. As a guideline, many ISPs provide up to 10MB of mail storage for each user account. If a large volume of mail is anticipated, it is wise to periodically backup and remove the mail files for each user account so that the hard disk does not become nearly full (ISMail will stop storing mail to prevent a full disk).
