The mailing list search feature would be much nicer and more useful if it could search the entire archives in one shot.

Currently, the search feature in the mailing list archives only returns results from the month you're browsing. I.e. if I'm looking at the archives for July, typing a search term into the search field, or even doing an advanced search, only finds messages from July. As far as I can see, the only way to search all months is to manually repeat the search on each month's page, which is a hassle.