Provide the ability to block ALL domains with a certain . ending - like using *.shop to block All emails coming from that domain.
Allowing only 500 domain blocks is ridiculous. Don't you know there are thousand upon thousands of permutations of the exact same domain - making it impossible to block them all. You NEED to use a very old method of entering (for example) *.shop to block ALL emails coming from that domain!
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Allen Dobrynin commented
The scam and junk emails coming from around the world is overwhelming! Your very WEAK attempt at providing blocking of these emails is ridiculously archaic - back to the early days of entering everything as line items. You NEED to implement the once ubiquitous method of entering data -- like providing for blocking ALL emails from a *.(whatever) domain.