Comment 2 for bug 558289

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Most of the automatic processing mail engines like autoresponder/vacation/SPAM-digest systems respect RFC 3834 mail header. So it is useful to add the RFC 3834 headers to any auto generated mail Mailman sends out, e.g.: subscribe, unsubscribe messages, password reminders, and perhaps any regular distributed post to the list (see rfc and search for list), cause it makes no sense to send back e.g. a vacation message to the originatin mail list for any of these types of messages.

For the right header tags and details see the rfc 3834.

The presence of the casual List-..... headers are not sufficient so far.

Hope this helps ... :-)