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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
  • 419 Views
  • 2 replies
  • 0 Helpful votes

Hello,I would like to configure a cluster with 2 ESA C370 appliances that are running the 7.5 software version.Data1 interfaces are connected to the DMZ (192.168.28.x/24) and the management interfaces are connected to a dedicated management network (...

Hi!   On our ESA (C100V), I have configured new Encryption Notification Templates under Text Resources for both HTML and text to inform external parties when they have received an encrypted message from us.  However, I cannot find where to apply thes...

oddstar by Level 1
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  • 2 replies
  • 0 Helpful votes

After I change the link from Satellite link to MPLS L2 VPN  between HQ and remote site , I got more bandwidth ,even though I have got outlook disconnect error.I am finding the root cause in Firewall, exchange server, and client PC. I can't decide the...

Zayar Win by Level 1
  • 6734 Views
  • 4 replies
  • 0 Helpful votes

I want to block all domains that end in .bid, .top and others.  I'm ok if they never make it to the various engines for processing and are dropped during the initial SMTP handshake.  How best to accomplish? I put .bid in the RAT with a reject, but I'...

Greg Hopp by Level 1
  • 3211 Views
  • 4 replies
  • 0 Helpful votes

First...i  read all tutorials about the automatic backup. e.g. https://supportforums.cisco.com/discussion/11111956/automating-backup-confighttps://supportforums.cisco.com/discussion/11849021/ironport-backup-and-import-processhttps://supportforums.cis...

Hello,   I have a VLN I have applied the license using loadlicense command  then I got additional feature key on the same VLN, I tried to check for new keys from vESA but it gives no keys,    <feature_key expiration="TIME" type="sophos">KEY</feature_...

We recently moved all user mail to a cloud service and wound down our internal mail servers. Some internal applications still need to send mail (to both our internal users in the cloud and third parties) as well as some legacy apps that need to recei...

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