SpamAssassin Rule: RCVD_IN_SBL
Standard description: Received via a relay in Spamhaus SBL
Explanation
The headers indicate the mail was sent via a server listed on the Spamhaus Block List (DNSBL).
The Spamhaus Block List (SBL) is a realtime database of IP addresses of spam-sources, including known spammers, spam gangs, spam operations and spam support services. SBL listings are made according to policies outlined in SBL Policy & Listing Criteria.
Further Info
The default scores for this rule can be found in the online list of tests.
For the body URI check see URIBL_SBL, and for other Spamhaus.org RBL listings see RCVD_IN_XBL RCVD_IN_PBL.