In the order they arrived, from the first email after signup.
How often, when and how Kindle emails its subscribers, measured from every email we received.
Every email Kindle sent in its first month, grouped by the day it arrived.
Every subject line and preview text, in the order they arrived.
We captured 2 emails from Kindle after signing up: account verification and welcome emails.
50% of its emails arrived on the day we signed up, it sends with Amazon SES, its designs lean teal and red and 50% of its emails use plain text.
Its subject lines run about 37 characters.