We have confirmed that the issue causing partial delays in email delivery to Microsoft 365 (Exchange Online) has been addressed by Microsoft and was resolved on September 5, 2026, at 01:05 AM (JST).
Emails delayed due to this incident have been automatically resent, so no manual action is required on your end to resend them.
We sincerely apologize for any inconvenience this may have caused.
Posted Sep 07, 2026 - 09:00 JST
Monitoring
本件についての続報です。
Microsoft 365(Exchange Online)宛のメール遅延につきまして、Microsoft 社にて対策が講じられたことを確認いたしました。 詳細につきましては、以下もご確認くださいますようお願いいたします。
Regarding the email delivery delays to Microsoft 365 (Exchange Online), Microsoft has also published information acknowledging this as an Exchange Online incident.
For further details, please also refer to the link below:
詳細につきまして、弊社システムチームにて調査を実施しております。 −−−−−−−−−−−−−−−−−−−−−−−−−−− We are currently experiencing a delivery delay for some emails sent to Exchange Online via HENNGE Email DLP.
As a result, there may also be delays in receiving authentication codes for HENNGE Secure Download.
Our systems team is currently investigating the details.