Mutt, Pine, grep, awk, etc. I don't understand why throwing a GUI interface on top automatically seems to make email search absolutely awful, this includes Gmail. I so often need to find a specific old email using a hazy match criteria that I am half tempted to pipe my email into Splunk (I run a small Splunk cluster at home for other needs) and use it (as then I don't need a local copy of every email on all devices or to need to SSH into a central box to do a TUI based search)