Operator Notes
5 min readWhat is Flowmails?
Self-hosted email API on Cloudflare: a routing platform that keeps your inbox and outbox in your own D1, with a REST surface and webhooks 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.
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Deep Dive
7 min readSelf-hosting your email data in Cloudflare D1 (no vendor lock-in)
A self-hosted email API starts with where the data lives: 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 email layer, 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
Self-hosted email without running Postfix: Cloudflare Email Routing + a Worker gives you a self-hosted mail server on the same runtime as the rest of your stack — no MTA, no Dovecot, no SpamAssassin.