if you labeled them or create a search that is specific to them ( perhaps from:mailing-list@address ):
there is a checkbox above the email listing. clicking it selects everything on the current page.
instead of clicking that, click the arrow next to it. a variety of selection options appears.
select "all"
a banner then appears that says you've selected everything on the current screen, and offesr to select everything that matches it in your account
click the offer to select all matching items
you can then issue a mass move or mass label or mass delete or whatever
I haven't tested this (I'm not purging my own mailing lists to try it :) ) and a selection mistake would be costly, but it appears to be correct.
if you labeled them or create a search that is specific to them ( perhaps from:mailing-list@address ):
there is a checkbox above the email listing. clicking it selects everything on the current page.
instead of clicking that, click the arrow next to it. a variety of selection options appears.
select "all"
a banner then appears that says you've selected everything on the current screen, and offesr to select everything that matches it in your account
click the offer to select all matching items
you can then issue a mass move or mass label or mass delete or whatever
I haven't tested this (I'm not purging my own mailing lists to try it :) ) and a selection mistake would be costly, but it appears to be correct.