I am not sure all GNU mailing lists are archived, but the ones I read are very well searchable and threads well explorable in the browser. I follow along daily

I am not sure all GNU mailing lists are archived, but the ones I read are very well searchable and threads well explorable in the browser. I follow along daily digests and Thunderbird displays threads nicely. I tag some or move them to my archives in Thunderbird. If I cannot find something, I check in the browser.