> ## Knowledge Base Index
> Fetch the complete knowledge base index at: https://help.easyfunnels.io/sitemap.xml
> Use this file to discover available pages before exploring further.
> Pure-Markdown content can be obtained by appending a '.md' suffix to the content URLs listed in the sitemap (without the trailing slash).

# Double Opt-In For Your Forms

Double Opt-In helps your users to verify their ownership of the email before they are added as subscribers to your lists.

When you select the lists to which you want to add the users you will see below the option to enable the double opt-in option. That will send an email automatically on which the user has to click in order to verify and be added as a subscriber.


![](https://storage.crisp.chat/users/helpdesk/website/29d1dac9d2098c00/double-opt-in_442x9w.png)