Postbye is a service that automates the cancellation of recurring subscriptions. It generates formal cancellation letters and sends them to businesses via certified mail through the United States Postal Service. This process creates a verifiable paper trail, providing users with tracking information and proof of delivery to confirm that a cancellation request was received. The user workflow begins with providing the details of the subscription to be canceled. Postbye drafts a formal letter based on this information, which the user can review and approve through a secure checkout process before it is dispatched. The letter is mailed the next business day, and the user receives the signed delivery proof once it is delivered. The service offers a subscription plan, Postbye Plus, which provides unlimited cancellation letters. Typical use cases include canceling gym memberships, streaming services, and other recurring billing arrangements where written notice is required or preferred. By utilizing certified mail, the service creates a legally recognized record of the cancellation request, allowing users to document the request and address any continued billing issues.