“It can be hard to pin down what makes a personal letter, along with what makes for its individuality and authenticity. Connection is the most basic ‘reassurance that I am not floating out there alone in the universe’, as Nina Sankovitch writes in Signed, Sealed, Delivered. A letter links two particular persons, even when its words are handed round and read to others. And while we’re more connected than ever now, our connections can be less specific – we post a lot of ‘personal’ updates to a varied or unknown audience who has no responsibility to respond.”