EG I want to block the .us domain as I've been getting tons of spam emails from randomly generated spam domains in that zone. If I create a filter "from:(@.us)" it also filters all the senders which name/domain contains "us" as well, e.g. usps.com which I don't want. Sure, I can add "-com" and such to the filter, but still it wouldn't cover everything, so I just want to block the entire domain zone. How to achieve that?
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