[capableweb]

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]

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]

They wouldn't have access to that information. ProtonMail doesn't provide it.