Also see notmuch [1] for a frontend-agnostic tagging/search system that also works great for multi-gigabyte maildirs. I use it with the Emacs client and lieer [2] for populating the maildir and syncing tags with Gmail labels using the Gmail API, which is a lot more reliable than offlineimap for me.
I enjoyed reading the Philosophy [1] behind Sup, for the glimpse into how Gmail's immediate search feature changed how people use email clients, and how it inspired Sup.
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[ 4.8 ms ] story [ 30.8 ms ] thread[1]: https://notmuchmail.org/ [2]: https://github.com/gauteh/lieer
[1]: https://github.com/sup-heliotrope/sup/wiki/Philosophy