All Polymail paid plans are on either monthly or annual billing cycles. If you need help switching between monthly and annual, shoot us an email at firstname.lastname@example.org. We'll be happy to help you get that sorted out!
Your Polymail subscription is good for your entire Polymail account. If you have synced one email address to your Polymail account or ten addresses, your plan covers all of them and you will be able to use your paid features across your account.
Your Polymail subscription also covers your account on all devices. If you are a paid user, you will have access to your paid features on your iOS device, on our Mac app, and in Polymail Web. You do not need to pay per device. You will just need to log into your paid account to access your paid features. 📱 💻 🖥