SpamAssassin rule
RCVD_IN_SBL_CSS
Sending IP is on the Spamhaus CSS list
+3.558 points
Header test
What RCVD_IN_SBL_CSS means
The IP is listed for sending low-reputation, snowshoe-style mail.
The rule's description in SpamAssassin: “Received via a relay in Spamhaus SBL-CSS”
How to fix it
Check the listing on spamhaus.org, stop sending to unverified or purchased lists, and request removal once fixed.
With 3.558 points this rule alone uses more than a third of the 5.0-point spam threshold, so fixing it matters.
Does your email trigger RCVD_IN_SBL_CSS?
Send it to a free test address: we run SpamAssassin, check SPF, DKIM and DMARC and show every rule with a fix.
Open the email spam checkerRelated rules
RCVD_IN_BL_SPAMCOP_NETSending IP is on the SpamCop list
RCVD_IN_DNSWL_HISender is on the DNSWL allowlist (high trust)
RCVD_IN_DNSWL_LOWSender is on the DNSWL allowlist
RCVD_IN_DNSWL_MEDSender is on the DNSWL allowlist (medium trust)
RCVD_IN_MSPIKE_BLSending IP has a bad Mailspike reputation
RCVD_IN_PBLSending IP is on the Spamhaus PBL
RCVD_IN_PSBLSending IP is on the PSBL
RCVD_IN_SBLSending IP is on the Spamhaus SBL
RCVD_IN_XBLSending IP is on the Spamhaus XBL
Frequently asked questions
What does RCVD_IN_SBL_CSS mean?
The IP is listed for sending low-reputation, snowshoe-style mail.
How do I fix RCVD_IN_SBL_CSS?
Check the listing on spamhaus.org, stop sending to unverified or purchased lists, and request removal once fixed.
How many points does RCVD_IN_SBL_CSS add?
3.558 points in the default SpamAssassin ruleset (network tests on, Bayes off). A message is treated as spam from 5.0 points. Mail servers can change scores locally.