Feature request: wildcards for white/back list

Hi Team, I have a request regarding White/Blacklist (in the context of Anti-spam)
It would be great to have wildcard support to block multiple domains at once (i.e. clock l1 domain completely).
Example:
I receive spam from :
multiple_users@domain1.icu
multiple_users@domain2.icu
multiple_users@domain3.icu
...

Instead of blacklisting individual (fake) addreses, it would be better to black-list .icu level 1 domain completely using Anti-Spam > Black-list.

wildcard support in blacklist would be HIGHLY appreciated and will help to reduce the load on the local spam processing engine.

FYI, Zendesk ID : 61882

Thank you