{"success":true,"data":{"id":"precedence-bulk-from-free-webmail","label":"Precedence: bulk/list from a free-webmail sender — spammer using mailing-list classification without real mailer infrastructure","description":"The message sets `Precedence: bulk` or `Precedence: list` — a legitimate bulk-mail / mailing-list marker used by newsletter platforms and RFC 2076 auto-responders — BUT the From address is on a free webmail domain (gmail.com, outlook.com, yahoo.com, protonmail.com, etc.). Companion to the iter 407 `list-id-from-free-webmail` signal targeting the same attacker fingerprint via a different header. Legitimate bulk mail always runs from dedicated mailer infrastructure on a business domain — SendGrid, Mailchimp, custom corporate domains. The combination of a bulk-classification header and a personal webmail sender means a spammer set `Precedence: bulk` hoping the classification makes their email route through filters less aggressively, but they can't afford the overhead of a real corporate domain. Weighted at +3 — stacks on top of the existing +2 `precedence-*` signal for a total of +5 on this shape.","tier":"danger","category":"header","isThin":false}}