Compute close to the mailbox.
Pmail keeps the routing and automation layer on Cloudflare Workers instead of asking you to maintain a traditional mail server.
Your messages stay in your account.
D1 stores structured mail data, while R2 can store attachments when you enable that binding in your deployment.
The platform is meant to be extended.
Use the REST API, Telegram automation, and role controls to fit Pmail into the workflows you already run.