These guys have nice Yahoo! Mail App for scanning your inbox automatically and aggregating purchase history: https://www.projectslice.com/mail_app https://www

These guys have nice Yahoo! Mail App for scanning your inbox automatically and aggregating purchase history: https://www.projectslice.com/mail_app https://www.projectslice.com/mail_app Full disclosure: I work for Yahoo! and supported them building this on the Yahoo! Mail app platform.