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41.

**Auto-suspend expired institutions**: If set, this option will allow Mahara to automatically suspend an institution that has expired automatically. This means that users of that institution will not be able to log in until the institution has been unsuspended.

42.

Account settings

43.

**Session lifetime**: For security reasons, after a specified period of inactivity, a user will be logged off the site automatically. This field specifies this time in minutes. The default value is 1440 minutes (24 hours).

44.

**Default account lifetime**: If set, user accounts will expire after this amount of time from when they were created. When a user account is expired, the user cannot log in. This time may be specified in days, weeks, months, years or "No end date". If the latter option is chosen, accounts will not expire by default.

45.

**Default account inactivity time**: If set, users who do not log in for this amount of time will be considered "inactive" and will not be able to log in anymore. This time may be specified in days, weeks, months, years or "No end date". If the latter option is chosen, users are not set to "inactive" by default.

46.

**Warning time for inactivity / expiry**: If set, a warning message will be sent to users this amount of time before their accounts are due to expire or become inactive. This time may be specified in days, weeks, months, years or "No end date". If the latter is chosen, users do not receive a warning before their account expires or they are flagged as having an inactive account.

47.

Security settings

48.

**Virus checking**: If you want all files uploaded by users to be run through a ClamAV virus scan, you should select the virus checking option. You have to have `ClamAV <http://www.clamav.net/>`_ installed on your server.

49.

**Path to clam**: The filesystem path to clamscan or clamdscan for virus checking. It is assumed that a failure of ClamAV to run will mean that a file should be treated as a virus, and a quarantine directory will be automatically set up by your Mahara installation.

50.

**Anti-spam**: There are three levels of anti-spam protection available for publicly visible forms, such as the contact and registration forms. A form submission is never silently rejected. Rather, an error message is displayed asking the user to try again if the submission is classified as spam. The three choices are: