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Long-form writing about self-hosted email in D1, Workers-native routing, the REST API, and the parts of the platform that show up in the security review.
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A tour of the runtime behind self-hosted email on Cloudflare: Email Routing, the Worker, the R2 bucket for attachments, and the D1 tables behind a single inbound message.
Cloudflare's email path runs through four primitives that each bill separately. Here's how Workers per-request, Email Services per-email, D1 read/write/storage, and R2 storage / operations stack up — and how to keep the bill predictable.
