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Ah I see, that I don't know (and I misread the original, quite correctly concerned post, my apologies). I am a customer and I will follow up with them about this. If I were to guess, they mean same accounts within the same organization, in case account setup has been automated.

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They could in theory hash the new password with every salt on every other account and see if there is a match... but that seems unrealistic, and if they can do it, it would imply that they are not using a slow hash algorithm such as bcrypt.

Yeah, that makes sense!

This is the response I got:

> Sorry, that part of the email wasn't clear. We don't compare passwords between Heroku accounts, this was more of encouragement so customers will hopefully practice good password hygiene.

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