Not the OP, but AFAIK, Nylas does store your email in their cloud.<p>This allows the client to be thin, since it&#x27;s only using the APIs and is shielded from the intricacies of dealing with mail protocols like IMAP and SMTP. It also allows Nylas to offer a single API that works across all your email.<p><a href="https:&#x2F;&#x2F;support.nylas.com&#x2F;hc&#x2F;en-us&#x2F;articles&#x2F;217518207-Why-does-Nylas-N1-sync-email-via-the-cloud-" rel="nofollow">https:&#x2F;&#x2F;support.nylas.com&#x2F;hc&#x2F;en-us&#x2F;articles&#x2F;217518207-Why-do...</a>