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At least a third of spam registrations on a platform I run come from Gmail addresses, with another third from yandex and yahoo. They also all went away after we implemented a nearly trivial captcha in the registration flow.

Seems to me that 1) Gmail accounts aren't that hard to farm 2) most spam comes from free webmail providers not disposable email and 3) a captcha will solve most of your problems and if it doesn't, it means your site is being specifically targeted by someone with cash to burn, so you can assume that they'll have emails that aren't on the blacklist. At that point, invest in detection and moderation.




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