

For example I would expect them to have a keyserver hosting the public Keys of their customers and making sure that only the real customer is able to update his public Key. So nobody else can publish a public key for a given E-Mail without being the owner of the E-Mail.
An ideal implementation could be Web Key Directory (short WKD).
I did a quick search if mailbox.org supports WKD. It looks like mailbox.org Guard somehow supports it, but I never tried it. So maybe it is worth having a look at that.
I like the “Power connected status change”. Helps to find out if the charger is relly plugged in. Hopefully Papers will receive support for digital signage which evince never did. This is still lacking in GNOME.