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Your claim that yahoo uses a 512bit key are counterfactual.

Please adhere to honesty and good faith arguments.

I never suggested that Yahoo uses 512bit keys, that's a misunderstanding.

The article clearly states that Yahoo is one of the 3 clients that didn't reject 512bit keys the way they should per RFC.

Yahoo Mail inbox users are vulnerable _receivers_ of spoofed emails.

remember when yahoo mail was the first one to implement DKIM validation and then all mailing list owners added a footer telling their subscribers not to use yahoo mail because it was broken, instead of calling their mailing list providers to upload a key? yeah nobody remembers, but yahoo probably do. i doubt they will err on the side of security again.

The Yahoo that built Yahoo Mail no longer exists, so actually they probably don't remember.

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