SHINDO2

Motosu City

Recipients53people

LEAK CONFIRMEDFull name / Email addressMisdelivery · Closed (final report)

Open in the live monitor ▶
Disclosed
Jun 10, 2026
Leak
Leak confirmed
Type
Misdelivery
Status
Closed (final report)
Security spend
Not checked yet
Compensation
Not announced

What leaked

IdentityName
ContactEmail address

How many

  • Recipients 53 people

Who is affected

  • Recipients of the disaster-training invitation

Cause

Addresses meant for BCC were put in the To field

Timeline

  1. Exposure began
  2. First disclosure

Response

  • Change process

Two-person checks before sending

What you should do

  1. Don't open links in emails from this company. The apology email itself may be fake
  2. You can be affected without ever using this service (parcel recipients etc.). Check any notice you receive
  3. Check the company's notice to see if you're affected

Lessons for companies

  1. Use DLP: recipient checks, send delay, automatic attachment protection
  2. Report to the PPC: preliminary in 3–5 days, final in 30 (60 if malicious)
  3. Run red teaming and AI-assisted hardening, and publish how much you invest

Sources