Operator notes on custom-domain email.

Long-form writing about provider-connected email, provider-native routing, the REST API, and the parts of the platform that show up in the security review.

Cloudflare Email Routing REST API send — getting outbound working

Cloudflare Email Routing handles inbound. For sending, you need Email Services + a Worker. Here's the REST API contract for outbound send, how the threading shape works, and how Flowmails wraps it.

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June 2026

Tutorial

8 min read

Wiring your product into the inbox: REST API and the durable event log

The shape of the Flowmails API, how the durable event log and the durable wait replace polling, and a worked example of inbound-to-ticket automation in 30 lines.

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