ive personally been using it on desktop since before i wrote the N9 or N900 port, and sailfish for a year or two. i posted the update to the N9 port only because i realized that i had made a breaking change recently, and wanted to make a final release at the breaking commit.

its not a polished app, and you have to install one of the deps via pkcon, but its the only email client ive ever used on SFOS and it does all the weird stuff i need. (like hearing different sounds based on different subject lines, for instance)

as for screenshots, it looks basically the same as N9
https://openrepos.net/content/teleshoes/qt-email