In the order they arrived, from the first email after signup.
How often, when and how Gumroad emails its subscribers, measured from every email we received.
Every subject line and preview text, in the order they arrived.
We captured 2 emails from Gumroad after signing up: account verification and company news emails.
It sends with Amazon SES and all of its emails use plain text.
Its subject lines run about 37 characters.