To add the allowlist spoofing sources for a policy:
Steps
Select Allow spoofing from these sources, and click the these sources link.
In the panel that appears:
Select the Domains tab to add allowed sender domain names, for example “forcepoint.com”.
Select the IP Addresses tab to add allowed sender IP addresses, either as a list of individual addresses, or address blocks in CIDR notation (for
example, 10.10.10.8/30). List entries are separated by a line break.
Click Add to enter a new domain or list of IP addresses. You can add multiple domains or addresses, and you can add a combination of domain names and/or IP
addresses if required.
For IP addresses or ranges, enter a short description/name to identify the IP addresses.