The best method we've found was to reject all letters with List-Unsubscribe header (or similar) sent to that victim.

This obviously has side-effects, but they're tolerable compared to the flood of letters.

I should note that these letters are usually sent in order to cover up something like a credit card statement, password reset or something other malicious. So be perceptive.

Attachment: smime.p7s
Description: S/MIME Cryptographic Signature

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