The Magic Pages Starter plan includes up to 2,000 email newsletters every month, the Pro plan up to 10,000 emails. That number is independent on whether you choose a monthly, yearly, or lifetime billing cycle.
If you're an early bird customer, this limit extends to 20,000 newsletters per month. You will see this reflected in the "Newsletter" tab in the customer portal.
On the Magic Pages free trial, you can send 100 emails during the 14-day trial period.