RFC3834 -

For those who like to provide gentle reminders regarding mailing list
etiquette to subscribers whose auto-responders reply to mail sent to
lists (rather than only replying when the recipient is specifically
named), there is now a standards-track RFC that you can reference to
reinforce that such responses SHOULD NOT be issued:

    RFC 3834
    Recommendations for Automatic Responses to Electronic Mail

Get it from your favorite RFC repository, such as: