Payment History
Names and domains of your emails senders
Transaction data tied to those accounts.
Yorba scans connected inboxes for two things: metadata and/or text indicative of an email sent via automated mailing list (as opposed to by an actual person), and language patterns typical of email sent in regard to an online account.
Other than the names of companies who send you emails, plus headlines and statistics re: how many email sends and how often you actually open them, nothing in/about your emails will be stored/analyzed.
