You can check/change it via WEB de Billing on My au (Web).
From "Set/Change Registration Contents" [登録内容の設定・変更], you can check the recipient address and whether or not display the amount in the body of "WEB de Billing Notification Email" [WEB de 請求書お知らせメール].
For details, see below.
Tap on "Billing" [請求書].
Tap on "Set/Change Registration details" [登録内容の設定・変更] under the "Billing" [請求書] section.
Select the phone number for the procedure and tap on "Select" [選択].
Check the settings on this screen.
If you want to change the content, tap on "Change" [変更する].
Select "Reception Settings" [受け取り設定] and "Notification Email Recipient" [お知らせメールの受け取り先], then tap "Confirm Changes" [変更内容の確認].
After confirming the changed content, tap on "Change" [変更].
The setting is now completed.
Has your problem been solved?