Why do users, realms and mail expire?
The system as a whole is required to expire certain information in order to keep the database from getting bloated. However, the lapse in time requires for the expiry of such features can be controlled individually. Modifications to the ‘/Attribute/System/SetTimeout*’ attributes will set the expiry time in days for each listed component. Note: The use of the command line tools are required for any maintenance to be conducted. See ‘What is CROND’ for additional details.