How is the annual fee email calculated?
The email fee is established based on your choice of MailUp edition (Web, Pro, Enterprise) and delivery speed. With the pay per speed model, the email fee does not have any monthly limits for the number of emails you send: even if you send more messages than planned, or larger messages, the cost does not change.
The only limitation is the message delivery speed: if you increase the delivery speed, the annual fee will increase.
In the My billing plan area, you can see the breakdown of costs and the various delivery speeds.