SpamAssassin rule
NML_ADSP_CUSTOM_MED
Missing signature from a domain that always signs
+1.2 points
Combination of other tests (meta rule)
What NML_ADSP_CUSTOM_MED means
The From domain (for example gmail.com, paypal.com or a bank) always signs its mail with DKIM, but this message has no valid signature from it, so it may be forged.
The rule's description in SpamAssassin: “ADSP custom_med hit, and not from a mailing list”
How to fix it
Do not send @gmail.com, @yahoo.com or similar addresses through other servers or newsletter tools. Use your own domain as the sender and sign with DKIM.
Does your email trigger NML_ADSP_CUSTOM_MED?
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_MED mean?
The From domain (for example gmail.com, paypal.com or a bank) always signs its mail with DKIM, but this message has no valid signature from it, so it may be forged.
How do I fix NML_ADSP_CUSTOM_MED?
Do not send @gmail.com, @yahoo.com or similar addresses through other servers or newsletter tools. Use your own domain as the sender and sign with DKIM.
How many points does NML_ADSP_CUSTOM_MED add?
1.2 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.