Simple Email — "Re: two of your answers don't fit together"

Why it works

From "Emily from Simple", the only sender name in the sequence that isn't just "Simple". The "Re:" suggests a reply to something the subscriber wrote, and the body claims to have found a contradiction in their survey answers. That is the survey's diagnosis device (results built from the visitor's own answers) again, a month later and by email. Every email in the sequence ends the same way: "You received this email as a registered user of Simple App."