[mdpm]

Does this distinguish between paid and non-paid accounts?

[shmoogy]

I don't know of any way to do so, we're not calling an api to check.

[mdpm]

Are you simply blocking @pm or @protonmail addresses, blocking domains that have protonmail MX, or blocking known protonmail SMTP servers?

[shmoogy]

I don't know how it's actually done, but we use Kount and have a lot of different rules set up within it. I know protonmail accounts get crazy high danger ratings based on our settings.

They've got all kinds of levers within the platform based on your risk tolerance.

[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.