Which type of spam trap is the most damaging?

Pristine spam traps are the most damaging because they prove the sender did not acquire the address legitimately. These traps are created specifically to catch unsolicited or harvested mail and they never belonged to a human.

Hitting a pristine trap is treated as a sign of poor acquisition practices and can trigger harsh filtering or even blocklisting.

It is the equivalent of colliding with a clearly marked naval decoy. The impact is immediate and the consequences are severe.