This email was shortly after Steve Jobs and Eric Schmidt blatantly discussed their illegal wage suppression scheme until Schmidt sent an email saying basically "let's stop emailing about our crimes".
https://9to5google.com/2013/01/23/court-docs-reveal-email-ex...
Including the exchange with Schmidt talking about a "paper trail" and thus the preference to "do it verbally". Though that part of the discussion seems Google internal and not between Apple and Google.
https://9to5google.com/wp-content/uploads/sites/4/2013/01/pa...