[MikusR]

That is a third party paid app.

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

[celso]

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.

[e38383]

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.

[prima-facie]

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.