Only the current version so far — new entries appear as the app ships updates.
auメール is a tools app by KDDI株式会社 with 5,000,000+ downloads (about 9.8M estimated). +32K installs in the last 7 days. Install growth, rank history, SDKs and ad networks.
From the store listing: “■About au mail app
・This is an official app for using the au mail service (@au.com/@ezweb.ne.jp) provided by KDDI Corporation, a mobile communications company, to au brand line subscribers.
・The au mail service is linked to the customer's mobile line contract, and an e-mail account will be issued according to the line…”