> For the complete documentation index, see [llms.txt](https://reference-guide.gitbook.io/crm-back-office-user-guide-full/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://reference-guide.gitbook.io/crm-back-office-user-guide-full/17.-settings/client-portal-blacklist-settings.md).

# Client Portal - Blacklist Settings

In the Blacklist settings, you have the ability to prevent certain users or nationalities from registering an account with your CRM. This can be useful for blocking individuals or nationalities that you do not want to have access to your system.