Originally Posted by storminternet
Generally reminder should be sent about renewal in specific time interval, once the renewal date is expired. This can be set in your billing software as per the convention and even if after couple of reminder if client do not responds or unwilling to renew; you can terminate an account.
That is what Billing Software like WHMCS does, as we have it set up. i think 1 invoice and 5 reminders in a 28 day period is enough for a client to pay or contact you