SpamAssassin rule
MISSING_MID
No Message-ID header
+0.14 points
Combination of other tests (meta rule)
What MISSING_MID means
The message has no Message-ID.
The rule's description in SpamAssassin: “Missing Message-Id: header”
How to fix it
Add a unique Message-ID such as <random@yourdomain.com>. Most libraries do this automatically.
Does your email trigger MISSING_MID?
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
FROM_EXCESS_BASE64From header needlessly encoded
INVALID_DATEInvalid Date header
MAILING_LIST_MULTILooks like mailing-list software
MISSING_DATENo Date header
MISSING_FROMNo From header
MISSING_HEADERSNo To header
MISSING_SUBJECTNo subject
MSGID_FROM_MTA_HEADERMessage-ID added by a relay
REPLYTO_WITHOUT_TO_CCReply-To but no To or Cc
Frequently asked questions
What does MISSING_MID mean?
The message has no Message-ID.
How do I fix MISSING_MID?
Add a unique Message-ID such as . Most libraries do this automatically.
How many points does MISSING_MID add?
0.14 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.