You can always use an ftp client or rsync to fetch mailing lists as a bunch of mboxes, and use a program like notmuch or mairix to search them very fast (not su

You can always use an ftp client or rsync to fetch mailing lists as a bunch of mboxes, and use a program like notmuch or mairix to search them very fast (not sure if notmuch supports mbox though, but I've used mairix in the past and it's nice).