A easy way to list out mail accounts that have not been used (logged o

==== Required information ====
- iRedMail version: 0.8.7 (Pro 1.8.2)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Debian Wheezy
- Related log if you're reporting an issue:
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Hi, is it an easy way to list accounts that is not in use. i.e. user have no logged on within the last 100 days?