feemanager 6.x-1.1

fixed a bug that i discovered and added new feature: now you can use periods such as weekly, fortnightly, monthly and yearly. If people make requests for other periods I might add a generic period such as hourly, 2 hours, 3 hourly, ..., 1 weekly, 2 weekly, 3 weekly, ..., ...

As far as i remember someone requested a feature for sending automatic emails to members who haven't paid their fees. How should i go about this feature?