Most list subscritors do not imagine that you can find there mail and
email using altavista/yahoo. There are extremly surprised descovering it.
It depends whether or not the mailing list is private.
Anyhow, private or public it seem's to me that it's not a good think to
leave robots like public altavista or yahoo indexing mailling list archive.
-1- If a pan-internet robot index mailling lists, the search you can have
with it may have a lot of inappropriate answers.
-2- Someone may trace my activity on the net looking for a set of information
where each one isn't very important but when joind together...
It much more beter to provide a archive spécific search engine like
the nice marc-Searh contrib where you can look at mails across différent
mailling list but just list by list.