We may introduce features that requirement a paid plan in future, but basic email sending will remai
We may introduce features that requirement a paid plan in future, but basic email sending will remain free. The major advantage of using a paid plan is you gain the ability to add a sender-id header, allowing you to specify which of your "end users" is responsible for each message. For people building apps that allow, say, their users to send messages to contacts in a SaaS platform, being able to specify a "sender-id" is helpful because it lets us block those individual senders rather than your entire CF-Worker.
