> For the complete documentation index, see [llms.txt](https://docs.stoik.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.stoik.io/cyber-best-practices/fr/durcissez-votre-environnement/email-authentication.md).

# Authentification des e-mails

L'authentification des e-mails protège votre domaine contre l'usurpation et le phishing en permettant aux serveurs de messagerie récepteurs de vérifier qu'un message provient bien de vous. Le Scan Externe de Stoïk signale les domaines qui sont absents ou mal configurés pour ces enregistrements.

Configurez les deux :

* [Qu'est-ce que le SPF et comment le configurer ?](/cyber-best-practices/fr/durcissez-votre-environnement/email-authentication/what-is-spf-and-how-do-i-configure-it.md): déclare quels serveurs sont autorisés à envoyer des e-mails au nom de votre domaine.
* [Qu'est-ce que le DMARC et comment le configurer ?](/cyber-best-practices/fr/durcissez-votre-environnement/email-authentication/what-is-dmarc-and-how-do-i-configure-it.md): indique aux serveurs récepteurs quoi faire des messages qui échouent à l'authentification, et vous fournit des rapports.


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# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.stoik.io/cyber-best-practices/fr/durcissez-votre-environnement/email-authentication.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.