# Blacklist

If you want to exclude specific domains from signing up onto your list. You can easily achieve this by adding such domains to your blacklist, which you can find under *Settings > Anti-fraud*.

<figure><img src="/files/WsqdpqjzTRvBTO8q51jT" alt=""><figcaption></figcaption></figure>

Just add one domain per line and make sure you only add the domain name and extension, without `www` or `http`

* ❌  <http://mydomain.com>
* ❌  [www.mydomain.com](http://www.mydomain.com)
* ✅  mydomain.com

After you add a domain to the blacklist, people who try to sign up using that domain will get a "*This domain is not valid.*" error.

**NOTE**: Blacklist is currently a PRO and Premium feature.


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# Agent Instructions: 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:

```
GET https://support.referralhero.com/settings/security/blacklist.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

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.