1
Navigate to settings page
Go to Settings → Page → Privacy
2
Select privacy option
In the Page visibility dropdown, select Email Protected
3
Enter your domain
Under Allowed email domains, enter one or more domains you want to allow (for example: onset.io, company.com)
Do not add public email providers (such as gmail.com, outlook.com, or yahoo.com). Doing so would make your page accessible to anyone using those domains.

