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Mar 27, 2025
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Update mta-sts.mdx #21181

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12 changes: 9 additions & 3 deletions src/content/docs/email-routing/setup/mta-sts.mdx
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Expand Up @@ -31,9 +31,15 @@ Next you need an HTTPS endpoint at `mta-sts.example.com` to serve your policy fi

To do this you need to deploy a Worker that allows email clients to pull Cloudflare’s Email Routing policy file using the “well-known” URI convention.

4. Go to your **Account** > **Workers & Pages** and press **Create Application**. Pick the "MTA-STS" template from the list.

![MTA-STS Worker](~/assets/images/email-routing/mta-sts-worker.png)
4. Go to your **Account** > **Workers & Pages** and press **Create Application**. Pick the default "Hello World" option button, and replace the sample worker code with the following:

```index.js
export default {
async fetch(request, env, ctx) {
return await fetch("https://mta-sts.mx.cloudflare.net/.well-known/mta-sts.txt")
},
};
```

5. This Worker proxies `https://mta-sts.mx.cloudflare.net/.well-known/mta-sts.txt` to your own domain. After deploying it, go to the Worker configuration, then **Triggers** > **Custom Domains** and **Add Custom Domain**. Type the subdomain `mta-sts.example.com`.

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