Overview
Only email addresses were provided to the contractor. No leak of names, addresses, phones or shipment data was confirmed. No count published (count blank). The notice does not name the provider.
Timeline
- Occurred
- Discovered
- Disclosed
Organization response
Per the notice, the organisation investigated and contained the incident, notified individuals and offered monitoring or protective resources.
What you can do
Be wary of emails, SMS or calls impersonating the organisation; do not open links or attachments or enter passwords or card details. Change reused passwords on other services.
Sources
- 当社委託先のメール配信サービスにおける情報漏えいのおそれについて日本郵便株式会社 · 2026-11-09