Operator Notes
5 min readWhat is Flowmails?
A Cloudflare-native email routing platform that keeps your inbox and outbox in your own D1, with a REST API on top.
Self-hosted · CFFlowmails
Runtime v0.1
Journal
Operator notes on Cloudflare-native email.
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.
Categories
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Deep Dive
7 min readSelf-hosting your email data in Cloudflare D1 (no vendor lock-in)
The architectural case for putting inbox and outbox in your own D1 database, and what that means in practice for compliance, exports, and exit plans.
Deep Dive
10 min readCloudflare Email Routing alternative: the parts that need a layer on top
Cloudflare Email Routing is the world's best front door for inbound mail. It isn't a database, an inbox UI, a REST API, or a send path. Here's what you add — and why the answer is a self-hosted Worker, not another SaaS.
Comparison
9 min readResend vs Flowmails — when hosted API wins and when self-hosted wins
Resend is the fastest possible first-send. Flowmails is the same primitive with your D1, no per-email pricing, and a Cloudflare account under your control. Pick Resend or Flowmails based on which of those you actually want.
Comparison
9 min readSendGrid alternative on Cloudflare — when self-hosted replaces an ESP
SendGrid is a great hosted ESP. If you want data residency, no per-email fees, and a control plane on the same Cloudflare account as your Workers, Flowmails is the switch that keeps the same operational model.
Comparison
10 min readMailgun alternative you can self-host on Cloudflare
Mailgun's hosted breadth (validation, lists, optimisation) is more than most teams need. Switch to Flowmails for the send / receive path; keep Mailgun only if you depend on its proprietary tools.
Tutorial
12 min readSelf-hosted mail server on Cloudflare — skip Postfix, route via Workers
Running your own Postfix / Exim / Dovecot stack is a real ops burden. Cloudflare Email Routing + a Worker gives you a self-hosted email platform without running an MTA — the runtime is the same one as the rest of your stack.