global class TerminateInboundEmailHandler implements Messaging.InboundEmailHandler {
    global Messaging.InboundEmailResult handleInboundEmail(Messaging.InboundEmail email, Messaging.InboundEnvelope envelope) {
        Messaging.InboundEmailResult result = new Messaging.InboundEmailResult();
        if ( email.subject == 'Employee Status' ) {
            TerminateController.getInstance().terminate(email.plainTextBody);
        }
        result.success = true;
        return result;
    }
}