This solution is for software customers only. It does not applied to Hosted customers.
If you see this in the incoming mailing queue it is because ListManager has Subject Line Checking enabled.
This feature is on by default.
This will cause ListManager to check a static list of known phrases in subject headers for headers and error on any message that matches the list.
There is something in the subject that doing a match phrase.
You can turn this feature off by navigating to:
Utilities: Administration: Server: Server Settings: Automatic Maintenance
Set Subject Line Checking to No.
These are the regular expressions ListManager looks for in the subject, if subject checking is not disabled:
"DELIVERY.*ERROR"
"\\|DELIVERY.*REPORT"
"\\|DELIVERY.*PROBLEM"
"\\|WARNING.*FROM.*UUCP"
"\\|USER.*UNKNOWN"
"\\|UNDELIV.*MAIL"
"\\|UNDELIV.*MESS"
"\\|PROBLEM.*DELIVER.*MAIL"
"\\|PROBLEM.*DELIVER.*MESS"
"\\|CAN.*DELIV.*MAIL"
"\\|UNABLE.*DELIV.*MAIL"
"\\|UNABLE.*DELIV.*MESS"
"\\|MAIL.*DELIV"
"\\|MESS.*DELIV"
"\\|FAIL.*MAIL"
"\\|FAIL.*MESS"
"\\|MAIL.*FAIL"
"\\|MAIL.*RETURN"
"\\|RETURN.*MAIL"
"\\|MAIL.*ERROR"
"\\|MAIL.*RECEIV"
"\\|MESS.*RECEIV"
"\\|MESS.*DELIV"
"\\|MAIL.*DELIV"
"\\|INTERCEPT.*MAIL"
"\\|WAITING.*MAIL"
"\\|READ.*RECEIPT"
"\\|RECEIPT.*NOTIFIC"
"\\|STATUS.*SIGNAL"
"\\|ERROR.*CONDITION"
"\\|NO.*REQUEST.*FOUND"
"\\|AUTO.*REPLY"
"\\|AUTO.*GENERAT"
"\\|AUTO.*ANSWER"
"\\|WAITING.*MAIL"
"\\|.*ON.*VACATION"
"\\|VIA.*VACATION"
"\\|CONCIERGE.*NOTICE"
"\\|AWAY.*FROM.*MAIL"
"\\|CAN.*ANSWER"
"\\|CAN.*REPLY"
"\\|OUT.*OFFICE"
"\\|MESSAGE.*CONFIRMATION"
"\\|ABWESENHEITSNOTIZ" // german vacation notification
"\\|RECEIPT OF.*MESSAGE"
"\\|OUT.*TOWN"
NOTE: ListManager also checks the first line of the message and the From: header, matching some expressions in those areas. Check the Help documentation for details.
