There are tools to import mails into whichever email client you prefer, especially if the list is archived on a public-inbox instance, which is the best mailing list archiving system so far.
https://lwn.net/Articles/875239/ https://blog.gnoack.org/post/lei/ https://people.kernel.org/monsieuricon/lore-lei-part-1-getti... https://b4.docs.kernel.org/ https://github.com/mikwielgus/forum-dl