Gmail/Yahoo bulk-sender rules (2024) force large senders (Netflix via SES,
etc.) to add List-Unsubscribe to verification emails too, so it can no
longer be an unconditional bulk signal — real access-code mail was being
filtered before the LLM and never reached code_mails.
List-ID/List-Post, Precedence bulk/list, and ESP campaign X-headers remain
unconditional. List-Unsubscribe alone is now exempted when the decoded
subject looks transactional (code/verify/OTP/sign-in/reset/验证码/…);
genuine ads that slip through still get codeExist=0 from the classifier.
TooonyChen
bc76275d04