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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 workloa...

dmccabej by • Cisco Employee
  • 2675 Views
  • 2 replies
  • 0 Helpful votes

Hi Team, This post is for all of you in the Netherlands who have customers (or your own company) that want to comply to internet.nl and get to that hall of fame with Cisco ESA's but have no clue how to get there or dont want to be too strict. What is...

Maartje by • Visitor
  • 2401 Views
  • 6 replies
  • 6 Helpful votes

I moved one of our SMTP boxes to a new SMA, and mail still works from both internals and externals. However, when trying to either release or send copy of a mail from the SMA, it says the email was sent successfully, but it never arrives. The only di...

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mvs23 by • Spotlight
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Our Cisco Secure Email Cloud Gateway (mx125.immenzaces.com, C600V) has two committed log subscriptions using Syslog Push over TCP to 223.177.121.15:514: "Mail_logs" (Consolidated Event Logs) and "mail_logs_nw" (IronPort Text Mail Logs). The port is r...

Hello,I've seen that IMS was EoS / EoL on cisco ESA. End-of-Sale and End-of-Life Announcement for the Cisco Secure Email Intelligent MultiScan (IMS) - CiscoWhat does it mean in terms of service?Since it was powerful as simple AntiSpam provided, does ...

REJR77 by • Level 5
  • 166 Views
  • 0 replies
  • 0 Helpful votes

Wanted to post some experiences from this week dealing with CVE-2026-76461 in case it helps anybody here. This is a timeline of my experience with some technical IOC's for those who may want to go huntingFor background, my org has two clustered Ironp...

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anyone who has encountered challenges upgrading ESA's Async OS to  15.5.5-014 ? on my case I keep getting an error message:ESA upgrade process fails with: “Failure downloading upgrade list: Failed to authenticate with manifest server,”

sndele by • Community Member
  • 271 Views
  • 3 replies
  • 0 Helpful votes