[HSE20260917-01-I] Incident: Service Disruption: Hornetsecurity Website

Update timeline

1. investigating Sep 17, 2026, 08:31 AM UTC

   The Hornetsecurity website is currently not available. The cause is currently being analyzed in more detail. Other services and email flow are not affected.

2. identified Sep 17, 2026, 08:32 AM UTC

   The Hoster found the root cause within a failed update on their system and is currently working on a solution.

3. monitoring Sep 17, 2026, 09:56 AM UTC

   The hosting provider has resolved the underlying cause, and all websites are fully accessible again. We are continuing to monitor the situation closely.

4. investigating Sep 17, 2026, 12:45 PM UTC

   The maintenance has now started. 365 Permission Manager Operational Germany - Frankfurt Operational United States - Georgia Operational 365 Multi Tenant Manager Operational Germany - Frankfurt Operational United States - Georgia Operational 365 Total Backup Planned Maintenance Canada - Montreal Operational France - Lille Operational Germany - Frankfurt Planned Maintenance Switzerland - Central Operational United Kingdom - London Planned Maintenance United States - Georgia Operational 365 Total Protection Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational AI Recipient Validation Operational Germany - Frankfurt Operational Advanced Threat Protection Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Control Panel Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational DMARC Manager Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Email Archiving Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Email Continuity Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Email Encryption Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Email Signature and Disclaimer Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Hornet.email Planned Maintenance Canada - Montreal Planned Maintenance France - Lille Planned Maintenance Germany - Düsseldorf Planned Maintenance Germany - Frankfurt Planned Maintenance Germany - Hannover Planned Maintenance Switzerland - Central Planned Maintenance United States - Atlanta Planned Maintenance Mail Traffic Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Spam and Malware Protection Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Security Awareness Service Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Teams Protection Operational Canada - Montreal Operational France - Lille Operational Germany - Düsseldorf Operational Germany - Frankfurt Operational Germany - Hannover Operational Switzerland - Central Operational United States - Atlanta Operational Ticket System Operational Europe - West Operational Website Operational Germany - Hannover Operational External Services AWS S3 Azure Cloudflare MS Office365 Wasabi Zendesk Locations Scheduled Maintenance [HSE20260922-01-M] Scheduled Maintenance: 365 Total Backup Service (FR & US Regions) Planned Maintenance Schedule September 22, 2026 10:00 - September 25, 2026 10:00 CEST September 22, 2026 08:00 -

5. investigating Sep 18, 2026, 11:06 AM UTC

   Although the maintenance is complete, this status will remain visible for awareness until Monday, 21 September. September 17, 2026 14:45 CEST

6. investigating Sep 19, 2026, 08:00 AM UTC

   Scheduled Maintenance has started. Hornet.email Security Maintanance Planned Maintenance Description At Hornetsecurity, we’re continually enhancing the security of the Hornet.email platform to keep pace with evolving best practices. As part of this ongoing work, we’re introducing a change that may affect some of your users’ accounts. Users who regularly sign in to Hornet.email will not be affected - no action is needed for them. For any of your users who haven’t logged into Hornet.email since April 28, 2026, their existing password will need to be reset the next time they try to access their account after September 17, 2026. What this means for your organisation: - Users who’ve signed in on or after April 28, 2026 are unaffected. - Users who haven’t logged in since April 28, 2026 will need a password reset the next time they access their account after September 17, 2026. - As a Control Panel administrator, you can perform this reset for any affected user whenever it’s needed. We’re sharing this so you’re aware of the potential impact and can support any inactive users smoothly if and when they need access again. If you’d like to review which of your users may be affected, you can check sign-in activity in the Control Panel at any time. Components Hornet.email Locations Canada - Montreal, France - Lille, Germany - Düsseldorf, Germany - Frankfurt, Germany - Hannover, Switzerland - Central, United States - Atlanta Schedule September 17, 2026 14:30 - 15:00 CEST September 17, 2026 12:30 - 13:00 UTC September 18, 2026 13:06 CEST