Outage in Cisco Secure Email
Cisco Secure Email Cloud Gateway - AsyncOS Announcement 16.0.4
Resolved Minor
January 26, 2026 - Started 3 months ago
- Lasted 14 days
Incident Report
When: Starting Jan 26, 2025
Maintenance Windows: Sunday-Friday
Europe Window: 6 PM to 2 AM (London)
Canada Window: 6 PM to 2 AM (Kamloops)
Americas Window: 6 PM to 2 AM (San Francisco)
APJ Window: 6 PM to 2 AM (Tokyo)
Europe Window: 6 PM to 2 AM (London)
Canada Window: 6 PM to 2 AM (Kamloops)
Americas Window: 6 PM to 2 AM (San Francisco)
APJ Window: 6 PM to 2 AM (Tokyo)
What: 16.0.4 ESA and SMA – Maintenance Release Upgrade cycle happens in two phases as below:
Phase 1: SMA AsyncOS 16.0.4-010 upgrade release notes are located here
Phase 2: ESA AsyncOS 16.0.4-016 upgrade release notes are located here
Phase 2: ESA AsyncOS 16.0.4-016 upgrade release notes are located here
Premium Software Support Customers: Your Cisco CSS (Customer Success Specialist - formerly known as Designated Service Manager) will engage with you directly to evaluate and coordinate these upgrades.
What’s New in AsyncOS 16.0.4: There are no new features added in this release.
Expected Impact: There should not be any email delivery disruption, however administrative access to your devices during this period may be affected. Customers are requested to validate health of systems post their upgrade window and report to Cisco TAC, if any anomalies are observed.
Secure Email Documentation
Release Notes: https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-release-notes-list.html
User Guide: https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-user-guide-list.html
Command Reference Guide: https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-command-reference-list.html
AsyncOS 16.0 API for Cisco Secure Email Gateway - Getting Started Guide:
https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-programming-reference-guides-list.html
Compatibility Matrix Guide: https://www.cisco.com/c/en/us/support/security/content-security-management-appliance/products-release-notes-list.html
Release Notes: https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-release-notes-list.html
User Guide: https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-user-guide-list.html
Command Reference Guide: https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-command-reference-list.html
AsyncOS 16.0 API for Cisco Secure Email Gateway - Getting Started Guide:
https://www.cisco.com/c/en/us/support/security/email-security-appliance/products-programming-reference-guides-list.html
Compatibility Matrix Guide: https://www.cisco.com/c/en/us/support/security/content-security-management-appliance/products-release-notes-list.html
Secure Email Cloud Documentation:
Combined Release Notes: https://www.cisco.com/c/en/us/support/security/cloud-email-security/products-release-notes-list.html
Email Cloud User Guide: https://www.cisco.com/c/en/us/support/security/cloud-email-security/products-user-guide-list.html
CES Status Page: https://status.ces.cisco.com/
Combined Release Notes: https://www.cisco.com/c/en/us/support/security/cloud-email-security/products-release-notes-list.html
Email Cloud User Guide: https://www.cisco.com/c/en/us/support/security/cloud-email-security/products-user-guide-list.html
CES Status Page: https://status.ces.cisco.com/
We value your opinion..
If you have any urgent questions about this maintenance or the possible impact, please contact Cisco TAC: http://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
If you have any urgent questions about this maintenance or the possible impact, please contact Cisco TAC: http://www.cisco.com/c/en/us/support/web/tsd-cisco-worldwide-contacts.html
Components affected
Cisco Secure Email CES Americas Cisco Secure Email CES Asia Cisco Secure Email CES Canada Cisco Secure Email CES Europe (Germany) Cisco Secure Email CES Europe (London)Latest Cisco Secure Email outages
CES Network Maintenance - about 2 months ago
Asia-Pacific Weekly Maintenance - about 2 months ago
Americas Weekly Maintenance - about 2 months ago
Canada Weekly Maintenance - about 2 months ago
Europe Weekly Maintenance - about 2 months ago
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