I used to use ‘mu’ a lot. It paired well with its extension that you might be able to find easier in a google search ‘mu4e’ (emacs), but it uses an xapian database for easy and fast queries. It was designed with the enormous amounts of email people receive in mind. Pairs very well with offlineimap. No easy (unless you like using termux) android use. Should be available on mac, however I don’t have a mac to test with. Should work with windows as long as you are okay with the WSL.

Before I forget to mention, it is a cli based application but I found it to be amazingly efficient for local email handling and search.

God tier search