How do you whitelist a domain in the greylisting interface?

[eugenevdm.host]

We have a legitimate domain that is failing greylisting. The problem, as expected, is the domain is not always using the same IP address to send. In fact, it's quite aggressively changing the IP address but it's a legitimate service from a legitimate sender, and more importantly, going to a paying client of ours.

I have read the documentation page here:

Greylisting | cPanel & WHM Documentation

This interface allows you to configure Greylisting, a service that protects your server against unwanted email or spam.

docs.cpanel.net

I followed the link to what appears to by WHM/cPanel's "Common Providers'" list here but our client's client's sender domain isn't there:

Common Mail Service IP Addresses | cPanel & WHM Documentation

Add these IP addresses and ranges to the Trusted Hosts in WHM's Greylisting to prevent them from being identified as spam.

docs.cpanel.net

I need to whitelist my own domain. How do I do that?

This is how it's done with Virtualmin, surely this should be possible with WHM? What am I missing?

 

[cPRex]

surely this should be possible with WHM?

Unfortunately it is not, as the Greylisting whitelist only accepts IP addresses at this time. I went ahead and created a feature request at Allow whitelisting of domains instead of just IP addresses in WHM >> Greylisting and I'll bring that up with the team at our meeting next week.