Composed provides you with an email address you can publish to the world instead of your real email address.
People who email your Composed address must pay a fee that you dictate. Once payment is confirmed, the email is forwarded to your real email address, and the funds are transferred to your account.
Spend your time reading high-quality emails from people who are willing to pay what your time is worth. Your inbox should not be a party that everyone is invited to.