Programmable Email Routing with Cloudflare Workers

Standard email filters only act after a message arrives, but Cloudflare Email Workers place custom programmatic logic directly at the SMTP edge. By pointing MX records to Cloudflare, developers gain access to three raw verbs: forward, reply, and reject. This breakdown explores the practical mechanics of pre-delivery routing, CPU limits when running local AI classification models, and the real-world impact of Sender Rewriting Scheme and ARC seals on downstream deliverability. Key sources: • Cloudflare, Email Workers handler docs — https://developers.cloudflare.com/email-routing/email-workers/ • Cloudflare, Email Service pricing, last updated 2026-06-09 — https://developers.cloudflare.com/email-service/platform/pricing/ • Cloudflare, Email Service limits, last updated 2026-10-30 — https://developers.cloudflare.com/email-service/platform/limits/ Episode 6420 — myweirdprompts.com/n/6420 (permanent short link: myweirdprompts.com/347863) Listen on Android: MWP FM Player — myweirdprompts.com/apk