Cloud mail filtering providers


I have some of my domains routed through EveryCloud - which I just noticed is supported in Email Settings -> Cloud mail filtering provider[s]. Which is great.

Is there any way to allow mail delivery only from EveryCloud for a specific domain - i.e. not to let other mail servers/clients deliver mail directly to my virtualmin server without going through EveryCloud (but only for specific domains)?

Also, I can’t find any documentation on this, do I need to fill in the field “ID with mail filtering provider”?