Downloading a whole maillist's archive

[Robert Moskowitz <rgm-ietf at htt-consult.com>]

I want to download the whole lisp maillist archive and import it into 
Thunderbird.

I have a plugin for Thunderbird that will take mbox format, and I have 
pulled in maillist archives from other organizations.

However, I have not found a link at ietf.org that allows me to download 
a whole maillist's archive (or at least by month).

I really want to review and search the archive before I jump in even 
with the conversations I had with lisp participants at the IETF meeting 
last week.