How to add free domain extension in spam list?

[aleksandar.m95]

Hello, I am receiving a lot of spams from emails which are using free domain. I am working only with companies if they are using paid domain. So I want to add free domains (.tk , .ml , .gf .....) extensions into SpamAssassin Spam List. Is there a way to do that?

I know how to block all addresses with one domain, example:
*@example.tk

But I want something like this:
@.tk

 

[cPanelLauren]

You should be able to also add *.tld in cPanel>>Email>>SpamFilters>>Blacklist

The following might also be helpful for using Global or User level filters for this: Spamassassin - blacklist all TLD allow whitelisted TLD?