SpamAssassin rule
NML_ADSP_CUSTOM_HIGH
Missing signature from a frequently spoofed domain
+2.6 points
Combination of other tests (meta rule)
What NML_ADSP_CUSTOM_HIGH means
The From domain is a heavily phished brand that always signs its mail, and this message has no valid signature from it.
The rule's description in SpamAssassin: “ADSP custom_high hit, and not from a mailing list”
How to fix it
Only that domain's own servers may send with its address. Use your own domain as the sender.
With 2.6 points this rule alone uses more than a third of the 5.0-point spam threshold, so fixing it matters.
Does your email trigger NML_ADSP_CUSTOM_HIGH?
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
ARC_INVALIDARC signature is invalid
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
Frequently asked questions
What does NML_ADSP_CUSTOM_HIGH mean?
The From domain is a heavily phished brand that always signs its mail, and this message has no valid signature from it.
How do I fix NML_ADSP_CUSTOM_HIGH?
Only that domain's own servers may send with its address. Use your own domain as the sender.
How many points does NML_ADSP_CUSTOM_HIGH add?
2.6 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.