By clicking on the box provided, you can enter the email addresses of senders from whom email will not be treated as spam and will always be delivered as normal. You can enter the specific email address, e.g. firstname.lastname@example.org, or if you enter the domain name only (e.g. domain.com), all emails from that domain will then be allowed.
To remove an email address from the whitelist, click on it once and then click “Remove”.