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Cisco Secure Email Gateway - Cisco
Cisco Secure Email Gateway
| Product Type | Email Security |
|---|---|
| Status | Available Order |
| Series Release Date | 30-JAN-2009 |
- Open a TAC Case Online
- US/Canada 800-553-2447
- Worldwide Support Phone Numbers
- All Tools
Feedback
Feedback- Getting Started with Cisco Secure Email Gateway:
- Email Threat Defense Guided Resources | Secure Email Protection Guided Resources
- Ask the Experts live sessions | Email Security training videos | Submit Email Messages to Cisco
- Enhance Your Existing Cisco Email Security: Free trials of new features for Cisco Email Security customers
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Top Search Results
Key Information
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Saved Content
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Recent Security Notices
- 19-Feb-2025
- 07-Feb-2025
- 05-Feb-2025
- 05-Feb-2025
- 06-Nov-2024
Document Categories
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Data Sheets and Product Information
- Email and Web Security Infographic 27-May-2015 (PDF - 508 KB)
- Cisco Registered Envelope Service AAG 17-Mar-2015 (PDF - 720 KB)
At-a-Glance
- Supporting Multiple Brands on the Cisco Registered Envelope Service 09-Feb-2020
- Supporting Multiple Brands on the Cisco Registered Envelope Service Data Sheet 10-Aug-2014 (PDF - 1 MB)
Data Sheets
- End-of-Sale and End-of-Life Announcement for the Cisco Secure Email Phishing Defense (TnC & SaaS Subscription) 13-Mar-2025
- End-of-Sale and End-of-Life Announcement for the Cisco Agari Domain Protection TnC and SaaS 16-Oct-2024
- End-of-Sale and End-of-Life Announcement for the Cisco Secure Email Virtual Appliance C000v & M000v 09-May-2024
- End-of-Sale and End-of-Life Announcement for the Cisco Email, Web and Security Management x90 Hardware Appliances 07-May-2024
- End-of-Sale and End-of-Life Announcement for the Cisco Secure Cloud Mailbox Defense SKUs (Product still orderable via ETD-SEC-SUB under new brand name Email Threat Defense) 04-Apr-2024
- End-of-Sale and End-of-Life Announcement for the Cisco ESA 14.2.x & 13.0.X & SMA 14.2.x releases 18-Oct-2023
- End-of-Life Announcement for the Cisco CRES Outlook Plugin 04-Oct-2023
- End-of-Sale and End-of-Life Announcement for the Cisco Email and Security Management x95 Hardware Appliances 21-Aug-2023
- End-of-Sale and End-of-Life Announcement for the Cisco ESA 14.0, 14.0.1, 14.0.2 & SMA 14.0, 14.1 releases 05-Oct-2022
- End-of-Sale and End-of-Life Announcement for the Cisco ESA 13.5.x,13.7 & SMA 13.0.x,13.5.x,13.6.x releases 01-Apr-2022
- End-of-Sale and End-of-Life Announcement for the Cisco Secure Email Term SKU’s 27-Mar-2022
- End-of-Sale and End-of-Life Announcement for the Cisco Email Product Bundles Under EMAIL-SEC-SUB and L-CES-SUB 03-Mar-2022
- End-of-Sale and End-of-Life Announcement for the Cisco Old SKUs for Email Security (now replaced by unified EMAIL-SEC-SUB SKU) 04-Feb-2021
- End-of-Sale and End-of-Life Announcement for the Cisco Email Security Annuity Migration 07-Jan-2021
- End-of-Sale and End-of-Life Announcement for the Cisco Email and Web Security Promotional PIDs 18-May-2020
End-of-Life and End-of-Sale Notices
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International English
- How to archive emails on the Email Security Appliance and Cloud Email Security? 24-Aug-2020
Q&A
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Security Notices
- Field Notice: FN - 64140 - Email Security Appliance (ESA) - Email Queue Corruption - Software Upgrade Required 09-Jun-2016
Field Notices
- Cisco Secure Email Gateway Email Filter Bypass Vulnerability 19-Feb-2025
- Cisco Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance Vulnerabilities 07-Feb-2025
- Cisco Secure Email and Web Manager and Secure Email Gateway Cross-Site Scripting Vulnerability 05-Feb-2025
- Cisco Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance SNMP Polling Information Disclosure Vulnerability 05-Feb-2025
- Cisco Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance Stored Cross-Site Scripting Vulnerability 06-Nov-2024
- Cisco Secure Email Gateway Server-Side Template Injection Vulnerability 17-Jul-2024
- Cisco Secure Email Gateway Arbitrary File Write Vulnerability 17-Jul-2024
- Cisco Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance Cross-Site Scripting Vulnerabilities 12-Jun-2024
- Cisco Secure Email Gateway HTTP Response Splitting Vulnerability 12-Jun-2024
- Cisco Secure Email Gateway, Cisco Secure Email and Web Manager, and Cisco Secure Web Appliance Cross-Site Scripting Vulnerabilities 11-Jul-2023
- Cisco Email Security Appliance and Cisco Secure Email and Web Manager Vulnerabilities 16-Feb-2023
- Cisco Email Security Appliance, Cisco Secure Email and Web Manager, and Cisco Secure Web Appliance Next Generation Management Vulnerabilities 30-Nov-2022
- Cisco Email Security Appliance Denial of Service Vulnerability 02-Nov-2022
- Cisco Email Security Appliance, Cisco Secure Email and Web Manager, and Cisco Secure Web Appliance Information Disclosure Vulnerability 02-Nov-2022
- Cisco Email Security Appliance and Cisco Secure Email and Web Manager HTTP Response Header Injection Vulnerability 02-Nov-2022
Security Advisories, Responses and Notices
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Release and Compatibility
- Release Notes for AsyncOS 15.0.4 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 09-Jul-2025 (PDF)
- Release Notes for AsyncOS 15.5.3 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 09-Jul-2025 (PDF)
- Release Notes for AsyncOS 15.5.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 09-Jul-2025 (PDF)
- Release Notes for AsyncOS 15.0.3 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 09-Jul-2025 (PDF)
- Release Notes for AsyncOS 15.0.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 09-Jul-2025 (PDF)
- Release Notes for AsyncOS 15.0.1 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 09-Jul-2025 (PDF)
- Release Notes for AsyncOS 15.0 for Cisco Secure Email Gateway - GD (General Deployment) 09-Jul-2025 (PDF)
- Release Notes for AsyncOS 15.5.1 for Cisco Secure Email Gateway - GD (General Deployment) 08-Jul-2025 (PDF)
- Release Notes for AsyncOS 16.0.2 for Cisco Secure Email Gateway - MD (Maintenancel Deployment) 05-May-2025 (PDF)
- Release Notes for AsyncOS 15.5.3 Hot Patch 2 for Cisco Secure Email Gateway 25-Mar-2025 (PDF)
- Release Notes for AsyncOS 16.0.1 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 21-Feb-2025 (PDF)
- Release Notes for AsyncOS 15.5.3 Hot Patch 1 for Cisco Secure Email Gateway 13-Jan-2025 (PDF)
- Release Notes for AsyncOS 16.0 for Cisco Secure Email Gateway - GD (General Deployment) 21-Nov-2024 (PDF)
- Open Source Used In AsyncOS 16.0 for Cisco Secure Email Gateway 02-Oct-2024 (PDF)
- Cisco Secure Email Gateway Software Lifecycle Support Statement 02-Oct-2024 (PDF)
Release Notes
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Reference
- CLI Reference Guide for AsyncOS 16.0.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 05-May-2025
- CLI Reference Guide for AsyncOS 15.0.4 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 13-Mar-2025
- CLI Reference Guide for AsyncOS 16.0.1 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 28-Jan-2025
- CLI Reference Guide for AsyncOS 15.5.3 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 16-Jan-2025
- CLI Reference Guide for AsyncOS 16.0 for Cisco Secure Email Gateway - GD (General Deployment) 03-Oct-2024
- CLI Reference Guide for AsyncOS 15.5.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 19-Aug-2024
- CLI Reference Guide for AsyncOS 15.0 for Cisco Secure Email Gateway - GD (General Deployment) 18-Aug-2024
- CLI Reference Guide for AsyncOS 14.2.1 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 18-Aug-2024
- CLI Reference Guide for AsyncOS 14.0 for Cisco Secure Email Gateway - GD (General Deployment) 18-Aug-2024
- CLI Reference Guide for AsyncOS 14.0.3 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 18-Aug-2024
- CLI Reference Guide for AsyncOS 14.0.1 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 18-Aug-2024
- CLI Reference Guide for AsyncOS 14.0.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 18-Aug-2024
- CLI Reference Guide for AsyncOS 14.3 for Cisco Secure Email Cloud Gateway 18-Aug-2024
- CLI Reference Guide for AsyncOS 15.5.1 for Cisco Secure Email Gateway - GD (General Deployment) 18-Aug-2024
- CLI Reference Guide for AsyncOS 14.2 for Cisco Secure Email Gateway - GD (General Deployment) 18-Aug-2024
Command References
- Useful Links Cisco Email Security Appliance C195, C395, C695, and C695F 06-Jun-2019
Documentation Roadmaps
- How to Generate a Demo or Evaluation License for SEG (IronPort) 01-Feb-2022
- How to Share SEG (IronPort) Traditional Licenses with Multiple Devices 01-Feb-2022
Licensing Information
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Design
- Best Practice for Email Authentication - Optimal Ways to Deploy SPF, DKIM and DMARC 18-Nov-2020
- External ESA to Cloud SMA Synchronization 15-Feb-2019
Design TechNotes
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Install and Upgrade
- Cisco Email Security Appliance C195, C395, C695, and C695F Hardware Installation Guide 09-Jun-2025
- Cisco Secure Email Gateway and Secure Email and Web Manager Virtual Appliances on Public Cloud Platforms Deployment Guide 03-Jun-2025 (PDF)
- Cisco Secure Email Virtual Gateway and Secure Email and Web Manager Virtual Appliance Installation Guide 04-May-2025 (PDF)
- Regulatory Compliance and Safety Information—Cisco Email Security Appliance C195, C395, C695, and C695F 11-Jun-2019 (PDF)
- Cisco Email Security Appliances C195, C395, C695, and C695F Getting Started Guide 06-Jun-2019 (PDF)
- Cisco x90 Series Content Security Appliances Installation and Maintenance Guide 18-Feb-2019
- Cisco 380 and Cisco 680 Series Hardware Installation Guide 18-Dec-2017 (PDF)
- Welcome to the Cisco x70 Series Content Security Appliances 24-May-2016 (PDF - 607 KB)
- Welcome to the Cisco x90 Series Content Security Appliances 26-Apr-2016 (PDF - 607 KB)
- Welcome to the Cisco x80 Series Content Security Appliances 26-Apr-2016 (PDF - 607 KB)
- Cisco Email Security Appliance C690 Quickstart Guide 12-Jan-2016 (PDF)
- Cisco Email Security Appliance C390 Quickstart Guide 12-Jan-2016 (PDF)
- Cisco Email Security Appliance C190 Quickstart Guide 12-Jan-2016 (PDF)
- End-User Guides 24-Jul-2014
- Release Notes for Configuration Migration Tool 1.0 for Cisco Content Security Virtual Appliances 14-Feb-2014 (PDF)
Install and Upgrade Guides
- Configure and Troubleshoot SWA, ESA and SMA Local Upgrade 28-Feb-2024
- Why is TLS version 1.0 disabled after AsyncOS upgrade 15-Jun-2023
- Upgrade SWA, ESA, SMA Locally 26-Aug-2021
Install and Upgrade TechNotes
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Configuration
- Automate Import and Export of Alias Configuration 11-Jul-2025
- Configure Content Filter to Trigger Blank Subject Emails 17-Jun-2025
- Configure DKIM Large Key Verification for Secure Email Gateway 18-Apr-2025
- Configure Secure Email Gateway Outbound Relay Mode 25-Feb-2025
- Configure Secure Email Gateway Outbound MTA-STS 25-Feb-2025
- Configure Microsoft 365 with Secure Email 13-Dec-2024
- Configure Email Encryption Add-in Using Microsoft O365 10-Jul-2024
- Configure ESA to Skip Uploading Unknown MIME Type Files to File Analysis Server 23-Apr-2024
- Configure Threat Scanner Per-Policy Scanning for SEG 18-Apr-2024
- Configure Secure Email Gateway Per-Policy Journaling to Secure Email Threat Defense 05-Apr-2024
- Configure TLSv1.3 for Secure Email Gateway 05-Apr-2024
- Graymail Unsubscribe Banner Customization for Cisco Secure Email Gateway 15-Aug-2023
- Reset Cisco SEG/WSA Hardware to Factory Default using enablediag console access 08-Aug-2023
- Automate or Script Configuration File Backup on SMA 27-Apr-2023
- Configure DKIM Signing on ESA 21-Apr-2023
Configuration Examples and TechNotes
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AsyncOS 16.x for Cisco Email Security Appliances
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AsyncOS 15.5 for Cisco Email Security Appliances
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AsyncOS 15.0 for Cisco Secure Email Gateway
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AsyncOS 14.2 for Cisco Secure Email Gateway
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AsyncOS 14.0 for Cisco Secure Email Gateway
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AsyncOS 13.7 for Cisco Email Security Appliances
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AsyncOS 13.5 for Cisco Email Security Appliances
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AsyncOS 13.0 for Cisco Email Security Appliances
Programming Guides
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Maintain and Operate
- User Guide for AsyncOS 16.0.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 05-May-2025
- User Guide for AsyncOS 15.5.3 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 20-Mar-2025
- User Guide for AsyncOS 15.5.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 20-Mar-2025
- User Guide for AsyncOS 15.5.1 for Cisco Secure Email Gateway - GD (General Deployment) 20-Mar-2025
- User Guide for AsyncOS 16.0.1 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 19-Mar-2025
- User Guide for AsyncOS 16.0 for Cisco Secure Email Gateway - GD (General Deployment) 19-Mar-2025
- User Guide for AsyncOS 15.0.4 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 13-Mar-2025
- Smart Licensing Deployment Guide for Cisco Secure Email Gateway and Cisco Secure Email and Web Manager 03-Oct-2024
- User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway - GD (General Deployment) 28-Jan-2024
- User Guide for AsyncOS 14.2.3 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 01-Nov-2023
- User Guide for Cisco Domain Protection 18-May-2023 (PDF)
- User Guide for AsyncOS 13.0 for Cisco Email Security Appliances - GD (General Deployment) 06-Jan-2023
- User Guide for AsyncOS 14.0.2 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 02-Jan-2023
- User Guide for AsyncOS 14.2.1 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 30-Dec-2022
- User Guide for AsyncOS 14.0.3 for Cisco Secure Email Gateway - MD (Maintenance Deployment) 30-Dec-2022
End-User Guides
- Test Destination Controls in ESA Using Email Bombing 14-Mar-2025
- SenderBase Frequently Asked Questions 14-Nov-2023
- Explain the File Analysis Client ID for Gateway, Cloud Gateway, and Email and Web Manager 08-Aug-2022
- Best Practice Guide for Advanced Malware Protection (AMP) on Cisco Email Security 19-Nov-2020
- Best Practice Guide for Anti-Spam, Anti-Virus, Graymail and Outbreak Filters 09-Jan-2020
- Best Practice Guide for Bounce Verification and Destination Controls 18-Dec-2019
- DANE for Email Security Appliance 26-Aug-2019
- Alter the Methods and Ciphers Used with SSL/TLS on the ESA 07-Jan-2016
- ESA Safelists/Blocklists Backup Procedure 04-Nov-2015
- What are the key features for the Anti-Spam Engine on the Cisco Email Security Appliance (ESA)? 07-Aug-2014
Maintain and Operate TechNotes
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Troubleshooting
- Reset Administrator Password and Unlock Administrator User Account 18-Nov-2024
- Cisco Email Security Appliance (ESA) Anti-Spam Efficacy Checklist 20-Nov-2020
Password Recovery
- Find a Contract Number and Add Access to Your Contract Number 16-Aug-2024
- Configure Transport Layer Security Version 1.0 on the ESA and CES 09-Aug-2024
- Why Do I Receive Responses from the Cisco Registered Envelope Service "via CRES <mail_delivery@res.cisco.com>"? 09-Aug-2024
- Understand why a Tech NDA Is Required to Troubleshoot 23-Feb-2024
- How Do I Set Up Multiple Company Logos on ESA and CRES? 26-Oct-2022
- Why does the ESA handle the DKIM authentication result "permfail" as "hardfail"? 29-Jul-2022
- Verify Sender Domain Reputation change on 14.2.0 AsyncOS upgrade 13-Jun-2022
- How do I troubleshoot why a message was not received by the Cisco Secure Email Gateway? 19-Mar-2021
- Restart and View the Status of Service Engines Enabled on ESA/CES 11-Dec-2020
- How do I configure the ESA to skip anti-spam and/or anti-virus scanning for my trusted senders? 20-Nov-2020
- ESA FAQ: How to allowlist recipient or sender emails 20-Nov-2020
- How do I blocklist or drop a sending domain using Incoming Mail Policy and Content Filter? 18-Nov-2020
- Can I allowlist or blocklist individual users via email addresses in the HAT? 18-Nov-2020
- I have added the domain 'example.com' to the ACCEPTLIST sender group. Why is it not working? 09-Nov-2020
- SDR: Sender Maturity FAQ 18-Jun-2020
Support FAQ
- Troubleshoot Connection to URL Retrospective Registration Service Failed. Certificate Verification Failed. 20-May-2025
- Troubleshoot Alert Message - Update Failed 04-Dec-2024
- Troubleshoot Alert Message - an Application Fault Occurred 04-Nov-2024
- Troubleshoot Email Encryption "Client Data Not Updated" Error 10-Jul-2024
- Troubleshoot Alert Message - Upload Limit Reached 25-Jun-2024
- Troubleshoot Alert Message - System Is Rate Limiting Envelope Sender 04-Jun-2024
- Troubleshoot Alert Message - Disk Quota for Miscellaneous Services 31-May-2024
- Response to Cisco Secure Email Gateway SMTP Smuggling Vulnerability Report 23-May-2024
- Reinitialize a Certificate on an Email Security Appliance 23-Apr-2024
- Restoring Vault Service on AsyncOS 15.0.2, 15.5.1 and later for Secure Email Gateway (SEG) 20-Mar-2024
- Understand Best Practices to Migrate Hardware ESA/SMA to Virtual ESA/SMA 15-Feb-2024
- Troubleshoot Failure to Join SEG to Cluster Due Matching Key Error 08-Feb-2024
- Troubleshoot SEG "Either API Server Is Not Started or Is Unreachable" 08-Feb-2024
- Troubleshoot Delivery Issues on the ESA 16-Jan-2024
- Understand and Troubleshoot Missing 3-Minute Range Data Intervals on SMA Message Tracking 12-Jan-2024
Troubleshooting TechNotes
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Log in to see available downloads.
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Below are the models within the Cisco Secure Email Gateway (formerly Cisco Email Security Appliance (ESA)):
Unless specified, documentation for the Cisco Secure Email Gateway is applicable to all models.
For additional model information and specifications, please refer to the Cisco Secure Email Gateway model comparison.
- Cisco Secure Email Gateway C195
- Cisco Secure Email Gateway C395
- Cisco Secure Email Gateway C695
Legacy models still supported (End-of-Support Date: 30-Jun-2024):
- Cisco Email Security Appliance C190
- Cisco Email Security Appliance C390
- Cisco Email Security Appliance C690
- Cisco Email Security Appliance C690X