SpamAssassin Rule: RCVD_IN_IADB_VOUCHED
Standard description: ISIPP IADB lists as vouched-for sender
Explanation
The sending host in the first trusted Received: header is a "Vouched listing" in the Institute for Social Internet Public Policy (ISIPP) Accreditation Database (a DNS Whitelist).
Further Info
The default scores for this rule can be found in the online list of tests.
Sites sending spam from IADB vouched IP addresses can be reported to abuse@suretymail.com.