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Important Announcements

Cisco Secure Email Add-Ins No Longer Supported on Microsoft Outlook 2019

This is to inform you that, effective October 14, 2025, Microsoft Outlook 2019 is no longer supported for the Secure Email Encryption Service Add-In and Secure Email Submission Add-In.

To continue using these Add-Ins, we recommend upgrading to Microsoft 365. Starting October 2025, download and install the new manifest for:

- Secure Email Encryption Service Add-In from the CRES Admin Dashboard

- Secure Email Submission Add-In from the Cisco Software Download Portal

After downloading the manifests, follow the instructions provided in the Submission and Encryption Add-In guides. For more information, see: Cisco Email Encryption - End-User Guides.

TLS 1.0/1.1 Deprecation from AsyncOS for Secure Email Gateway, Starting version 16.5

We would like to inform you that starting with the AsyncOS 16.5 release, TLS versions 1.0 and 1.1 will no longer be available as configuration options in both the CLI and GUI.

To ensure secure email delivery and receipt, you should use TLS versions 1.2 and 1.3. These versions can be configured via the sslconfig CLI command or through the System Administration > SSL Configuration menu in the user interface.

For detailed instructions on updating TLS versions, please refer to the “System Administration” section of the User Guide for AsyncOS 16.0.x for Cisco Secure Email Gateway.

 

Forum Posts

  Important: Migrate from Secure Email Virtual C100V Models to Avoid McAfee-Related Issues Dear Valued Customer, We are reaching out to ensure your Cisco Secure Email environment continues to operate at optimal performance and reliability. As worklo...

dmccabej by Cisco Employee
  • 876 Views
  • 2 replies
  • 0 Helpful votes

Hi all, Hope you all are doing great. Not sure if this is the correct location, feel free to move the question to another location if not.I am currently in the process of migrating a physical appliance with AsyncOS v.7 to a virtual appliance with Asy...

Rick187 by Level 1
  • 2083 Views
  • 1 replies
  • 5 Helpful votes

Resolved! mta-sts

Hi, please correct me if I am wrong: Cisco ESA doesn't support mta-sts? For example: to configure policy ESA has to check and follow mta-sts policy published by the recipient? If I am correct is there any plan in the roadmap to enable mta-sts?Tnx,Jer...

Hey everyone, To some it might seem like a dumb question, but how do you enable API in IronPort. The AsyncOS API document states that I need to navigate to  Network > IP Interfaces, however, I'm not seeing this option.   We are using C100v/M100v. Tha...

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DunDmy by Level 1
  • 1886 Views
  • 3 replies
  • 0 Helpful votes

Hi, I've seen many installed ESA Box using default private Cisco certificate, which are working fine. my question is in which condition should we use Publicly signed certificate and for what purpose ? even on inbound and outbound listeners also using...

Just a question - do people still find the DHAP (Directory Harvest Attack Prevention) still useful? We've had it on for years but in the last couple of months had two major "denial of service" of email due to DHAP triggering and causing way more harm...

tminchin by Level 1
  • 2436 Views
  • 3 replies
  • 0 Helpful votes

Hello All, Wants to move my onpremise Cisco Email Security Solution to Cisco Cloud Email Security. Is it any such migration document available from there i can get some helpful points. Please find attached rough diagram which states currently my offi...

sv7 by Level 3
  • 3547 Views
  • 7 replies
  • 0 Helpful votes