Wildcards in domain names: Possible?

[kc7gr]

Good day,

Ver. 26.1-2, using a couple of custom anti-spam blocklists including one for FQDN.

What I want to do is block all traffic coming from any domain ending in *.outbound.protection.outlook.com (wildcard shown as an example). Unfortunately, I can't find a way to apply a wildcard as shown.

Is there a way to do this which doesn't require a Masters in network engineering?

Suggestions welcome. Thanks much!