[Mailman-Users] recovering old emails

["Eduardo J. Quirós B."]

I´ve looked around the list archives, the mailman homepages and using 
google on how can I get mailman to send me again an old email.
I haven't found a way to get the archives in their original format, wath I 
get is a txt file containing the mime attachs.
Nowdays it's ultracommon to have figures, html etc in a email and I need to 
recover old emails.

Is there a way or a soft or plug-in that does this?
thanks