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Being that we're talking about blocking emails based on fraud, I'd be understandable towards not wanting to share exactly on how you do it.

• mdpm 6y ago
  Yeah, that wasn't the original question. I'm a paying protonmail customer, for privacy, for my whole family. Trying to get a read of how much that's likely to be an issue in future.
  • wizzwizz4 6y ago
    They wouldn't have access to that information. ProtonMail doesn't provide it.