Today I want to feature a cool new plugin from Paul Gibbs that allows you to automatically expire user passwords. Expire User Passwords is a very simple plugin with zero configuration required. Simply install and activate and your users will be forced to change their passwords every 30 days.
You can also change the expiry period to be something other than 30 days if you like. It comes with a define that you can use in your wp-config.php file called ‘TMG_AEP_EXPIRY’,. Just set the value to the number of seconds until you want the login to expire.