Hmm, looks like it is not covered inOn Tue, 2014-02-11 at 03:07 +0400, Emre Erenoglu wrote:
> I checked the help pages to see if there's any way to mark read or unread
> using keyboard shortcuts but I could not find any.
>
> It does not exist or is it undocumented?
https://help.gnome.org/users/evolution/stable/mail-reading-keyboard-shortcuts.html
but the shortcuts are displayed under "Message > Mark As" in Evolution:
Ctrl+K and Ctrl+Shift+K.