> For the complete documentation index, see [llms.txt](https://docs.dnscontrol.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.dnscontrol.org/language-reference/domain-modifiers/smimea.md).

# SMIMEA

`SMIMEA` adds an [S/MIME cert association record](https://www.rfc-editor.org/rfc/rfc8162) to a domain. The name should be the hashed and stripped local part of the e-mail.

To create the name, you can the following command:

```bash
# For the e-mail bosun@bosun.org run:
echo -n "bosun" | sha256sum | awk '{print $1}' | cut -c1-56
# f10e7de079689f55c0cdd6782e4dd1448c84006962a4bd832e8eff73
```

Usage, selector, and type are ints.

Certificate is a hex string.

To create the string for the type 0, you can run this command with your S/MIME certificate:

```bash
openssl x509 -in smime-cert.pem -outform DER | xxd -p -c 10000
```

{% code title="dnsconfig.js" %}

```javascript
D("example.com", REG_MY_PROVIDER, DnsProvider(DSP_MY_PROVIDER),
  // Create SMIMEA record for certificate for the name bosun
  SMIMEA("f10e7de079689f55c0cdd6782e4dd1448c84006962a4bd832e8eff73", 3, 0, 0, "30820353308202f8a003020102..."),
);
```

{% endcode %}


---

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