What happened to Geary[1]? Looks very similar, and it used to be the elementaryOS email client. At least until it was forked into Pantheon Mail. https://wiki.

What happened to Geary[1]? Looks very similar, and it used to be the elementaryOS email client. At least until it was forked into Pantheon Mail. https://wiki.gnome.org/Apps/Geary https://wiki.gnome.org/Apps/Geary