This is exactly why I do it, it's eye opening to see exactly which companies leaked your address. As a result of being able to blackhole the leaked addresses I no longer get any spam, the Dvorak dream.
I actually caught a company outright selling my address to AWS of all places, I didn't even know Amazon purchased mailing lists.
AWS were crafty because they didn't directly sell a service, they only offered "resources" for "business leaders" because they knew nothing about what I might need.
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