It is "web_info@j" for "Seikyu gaku Oshirase email (billing amount notification email)."

With the measures against spam emails, you may not be able to receive the "Seikyu gaku Oshirase email."

When you set up your email to receive "Seikyu gaku Oshirase email," please make sure you set up the reception for the email address or domain as "permitted."