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That is a third party paid app.

The Cloudflare one is in preview https://developers.cloudflare.com/email-routing/

We're mass enabling the zones that have asked for Beta access and will be going GA soon. Email me at celso@cf if you can't wait; we'll try to prioritize.

Are you going to add smtp relaying / sending mails too?

Otherwise this is a one way street, you can receive mail on your domain, but not send from it.

You can use the SMTP relay from other providers. The free tier should be enough for a personal account or two. For example AWS SES, Mailgun, Sendgrid, etc.

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