On Sat, Dec 24, 2022 at 9:12 PM Michael Deutschmann <[email protected]> wrote:
> On Mon, 12 Dec 2022, you wrote: > > > Blind-carbon-copy is already a sign of spam. > > > > Except when it's not, like this very mailing list. > > Only if you don't whitelist *all* forwarders you set up and mailing lists > you have joined first, overriding the Bcc filter on a match. > I've always expected that requiring users to register and deregister every mailing list they join or depart would be interpreted as tedious and a disincentive, resulting in complaints (and thus support costs or lost customers) when they forget or get it wrong. It seems like a tactic that won't succeed at scale. > It's easy to sort wanted mail between forwards/mailing-lists and normal > narrow-casted mail. Spam can masquerade as either; but if possible a > spammer would want to look like narrow-casted mail as that is the only > kind that could be expected to arrive from a stranger. To use this > exploit, they must give that up. > If you're talking about replay, I don't understand "must". The replay attack under discussion works fine if it's unicast. -MSK
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