Actually, this mailing list neither adds in a "Mailing-List: ..." header
nor a "Precedence: bulk" header, which are the two easiest ways to spot a
modern mailing list. I'd suggest you complain to the mailing list
managers, not the poor people whose [most likely] properly configured
autoresponders aren't being given the information they should be given.
Actually, the way to spot *any* mailing list is to notice that your
email address is not listed in the To: or Cc: lines.
These peoples' autoresponders are broken; the list is fine.
--asp@partan.com (Andrew Partan)