Thanks for your interest in local email clients, more choice there is welcome! In the description it is said one can file email with a key, by associating fold

Thanks for your interest in local email clients, more choice there is welcome! In the description it is said one can file email with a key, by associating folders to keys. Keyboard operation is very important to me. However direct key/folder association doesn't scale to a large number of folders. Have you considered a feature like the "Nostalgy" extension for Thunderbird? [1] With Nostalgy one type "s" to file/save an email, then a string which is matched to folder names. It's a bit like helm for emacs (except it's exact match, space is not interpreted as an "AND" like with helm). The commands are go/save/copy, and then string match. This scales very well. That could be an advanced feature, as for beginners the direct key/folder association is simpler. But I guess you will target advanced users too, and for them it may be an important feature. [1] https://addons.mozilla.org/en-US/thunderbird/addon/nostalgy/ https://addons.mozilla.org/en-US/thunderbird/addon/nostalgy/