SpamAssassin rule
ARC_INVALID
ARC signature is invalid
+0.1 points
Combination of other tests (meta rule)
What ARC_INVALID means
The message passed through a forwarder that added an ARC signature, and it does not verify.
The rule's description in SpamAssassin: “ARC signature exists, but is not valid”
How to fix it
Usually caused by a forwarding service, not by you. Test by sending directly instead of through a forwarder.
Does your email trigger ARC_INVALID?
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
DKIM_ADSP_ALLDomain says it signs all mail, but this message is unsigned
DKIM_ADSP_DISCARDDomain asks to discard unsigned mail
DKIM_ADSP_NXDOMAINFrom domain does not exist
DKIM_INVALIDDKIM signature is invalid
DKIM_SIGNEDMessage is DKIM-signed
DKIM_VALIDValid DKIM signature
DKIM_VALID_AUDKIM signature from your own domain
DKIM_VALID_EFDKIM signature from the envelope sender's domain
DMARC_MISSINGNo DMARC record
Frequently asked questions
What does ARC_INVALID mean?
The message passed through a forwarder that added an ARC signature, and it does not verify.
How do I fix ARC_INVALID?
Usually caused by a forwarding service, not by you. Test by sending directly instead of through a forwarder.
How many points does ARC_INVALID add?
0.1 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.