In the order they arrived, from the first email after signup.
How often, when and how Back4app emails its subscribers, measured from every email we received.
Every email Back4app 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 Back4app after signing up: account verification and welcome emails.
All of its emails arrived on the day we signed up, it sends with mostly Mailchimp Transactional, and also Amazon SES, its designs lean green and 50% of its emails use plain text.
Its subject lines run about 50 characters.