Do I need end-to-end encryption on my mailbox?

Inbox Zero for Privacy, not Productivity inspired me to achieve an actual Inbox Zero at my e-mail provider, thereby sufficiently solving the challenge of e-mail encryption for my risk profile.1 As a result, I am able to choose a budget-friendly e-mail provider without paying a premium for 'privacy features'. I chose to use the Thunderbird method as described in the blog post linked above. In practice, I rely on the following approach: Recently received e-mails: These e-mails remain in my Inbox and are accessible from any device (Webmail/IMAP) until I process them. Processed e-mails which I might require on the go (for example: reservations, hotel bookings, tickets): These e-mails get archived to my local Thunderbird archive when I am on my laptop. Moreover, I save a temporary copy (.eml) of these e-mails in a folder which I sync with Syncthing. As a result, I can access these e-mails on any device, even though they are no longer hosted at my e-mail provider. Processed e-mails which I…