"Mail coming from a daemon"

What does the following header line mean? X-Diagnostic: Mail coming from a daemon, ignored I'm having trouble subscribing a particular person to the list from a web interface provided by my web provider, and this is appearing in the header of the message sent back to the list administrator. Also, is there a particular reason why I need to look in the mail header for specifics of why something has gone awry? Couldn't this information be reported in a more user-friendly manner in the message body? -- Bruce Vander Werf brucev@cyberlink.com