> 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 Authorization** Protect your messages and boost their credibility*

Every new account in the EmailLabs system is automatically assigned a sandbox domain. This mechanism becomes active following full account verification by the Support Team. The activation process takes place after completing your company details and filling out a short survey regarding the nature of your planned sending activity. This solution enables you to run tests in a production environment without having to wait for your own DNS records to be deployed.

<figure><img src="https://1834454488-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FxRBDHL4zFAAFTf3m7JIr%2Fuploads%2FomYXz7uengZKyM44HV0x%2Fobraz.png?alt=media&amp;token=94493a1e-2693-4bcd-bb9f-e42733956100" alt=""><figcaption></figcaption></figure>

However, to ultimately protect your account against unauthorized sending and ensure a high sender reputation, full authorization of your own sending domain is required. This process allows you to cryptographically sign messages with a DKIM key and configure additional security standards, such as a dedicated Return Path, Whitelabel for links, and a DMARC policy.

You can find detailed instructions for this process here: [Senders Authorization](/en/email/sender-security/senders-authorization.md)