Journal
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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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.
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.
If your team only used Postmark for transactional mail, switching to Flowmails keeps the same shape and removes the per-email fee. Newsletter / broadcast stays on whatever tool you have.
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.
SES is excellent at volume. Flowmails is what you ship when you want email on the same Cloudflare account as your Workers, R2, and Pages — no separate AWS relationship, no per-email fees on top.
