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Two Ways to Send Email from Cloudflare Workers: Native Binding vs External API

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Developers using Cloudflare Workers can send emails via either Cloudflare's native Email Service binding or an external HTTP email API like Notify. The native binding requires no external API key but is currently in beta and restricted to the Workers Paid plan, meaning free-tier users cannot send to arbitrary recipients. Setup involves onboarding a domain through the Cloudflare dashboard, after which DNS records such as SPF, DKIM, and DMARC are added automatically. The external API approach uses a standard fetch() call with a stored secret key, making it compatible with Workers' V8 isolate runtime, which does not support Node.js-specific libraries. Both methods support sender and recipient restrictions, and the native binding simulates email locally by default without actually sending messages unless remote mode is enabled.

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Two Ways to Send Email from Cloudflare Workers: Native Binding vs External API · ShortSingh