Kavi Knowledge Base

While investigating an mail delivery issue, you may see a message similar to this in the logs:

2009-05-01 11:58:49 ... sent 5792 bytes from qp 21747
2009-05-01 11:58:49 + ... bounce: qp 21750
2009-05-01 11:58:49 + mylist@mysite.org ... failure: reject: fatal: Sorry, I don't accept message with empty Subject (#5.7.0)

(http://www.mysite.org/kmlm/admin/mail_logs)

Verify whether the user sent a message with a blank subject line to the list. Frequently, spam is sent with a blank subject line, so the default behavior is to send a bounce message to the sender. This message asks the sender to add a subject line and resubmit the email. Currently, the known best practice is to disallow blank subject lines (for security and spam reduction reasons).

More information about mail delivery error messages is available online here:
http://community.kavi.com/khelp/kmlm/user_help/html/what_does_message_mean.html#message_lookup_tables