> For the complete documentation index, see [llms.txt](https://docs.emaillabs.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emaillabs.io/en/first-steps/sender-authorization.md).

# Sender Authorization

Sender authentication is a functionality that allows you to authenticate domains, which enables you to conduct sendings through EmailLabs.

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Authorization ensures the security of your account against unauthorized sendings by third parties. Additionally, emails are signed with a **DKIM key**. 
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**Detailed instructions can be found here:**

<table data-view="cards"><thead><tr><th></th><th></th><th></th></tr></thead><tbody><tr><td>👩‍💻 <strong>Sender Authorization</strong></td><td>Learn the correct procedure for authorizing a domain or email address.</td><td><a href="/pages/iQxK2KLYI5MzOAs8E5Oe">MORE >></a></td></tr></tbody></table>