cloudflare-email-service

Add a send_email binding to wrangler.jsonc with a name like EMAIL, then call env.EMAIL.send() with to, from, subject, and html or text fields. The from domain must first be onboarded with wrangler email sending enable yourdomain.com.

The Workers binding uses email in the from object and replyTo, while the REST API uses address and reply_to in snake_case. The binding returns a messageId, whereas the REST API returns delivered, permanent_bounces, and queued arrays.

Export an email() handler from your Worker and create a routing rule pointing addresses to it. Buffer message.raw once with new Response(message.raw).arrayBuffer(), then parse it with postal-mime to access subject, text, and attachments.

This error means the from domain has not been onboarded to Email Sending. Run wrangler email sending enable yourdomain.com or onboard the domain in the Dashboard, which auto-configures SPF and DKIM records.

No, Email Service is restricted to transactional email triggered by user actions such as signups, password resets, and order confirmations. Marketing or bulk campaigns require a dedicated marketing email platform.

The raw stream is single-use, so a second read returns empty content. Buffer it first with const raw = await new Response(message.raw).arrayBuffer() before parsing or forwarding.