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Page 29: Verification by recipients

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Sites like Cambridge and Verizon are already doing callback
verification, which is a very effective anti-junk test.
They will immediately be able to detect forgeries.

But callbacks turn spam runs into DDOS attacks on the joe-jobbed
site. Spam has different scaling properties from legitimate email so
encouraging widespread use of callbacks is probably not wise.

A lightweight callback protocol might mitigate this problem, but
persuading people to deploy it will be a struggle.

A more interesting alternative is to play tricks with DNS.

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