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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.

 

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MAIL FROM identity alignment

My Cisco Domain Protection appliance says that my Cisco ESA is sending out email with an identity misalignment because instead of the MAIL FROM being my company domain, it is esa.hc####-##.iphmx.com.  How do I change this so that the MAIL FROM is my ...

Resolved! ESA View Email

We are currently investigating ESA as a possible upgrade from our current solution. One question came up by the security team. In the current solution they have, they are able to view an email inside the GUI of there current solution for security pur...

Resolved! ESA URL filtering

Hi, I received an email containing a phishing attack. When I examined the url in the mail, my e-mail address was also written in the url. This is often used in phishing attacks. When you go to the page, you will see that your e-mail address is writte...

sfk by • Level 1
  • 5071 Views
  • 4 replies
  • 0 Helpful votes

Resolved! URL reputation and category, content filter condition or action

HiI want to create a content filter which detect unwanted URL's based on reputation and one filter based on URL category.These messages must be changed as follows,redirect URL's to the web security proxy,change subject with a warning andredirect mess...

ESA Smarlicense balance

Hi community,I recently switched to Smart account/licensing for one customer's ESA cluster. They have 1000 mailboxes license. After provisioning and authorizing the appliances I see in Cisco Smart account for the relevant features only 2 in use and t...

kaizen by • Level 1
  • 783 Views
  • 1 replies
  • 0 Helpful votes

Resolved! Anti-Spam threshold impact

Hello, In this documentation about ESA   https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118220-technote-esa-00.html#:~:text=Reduce%20Suspected%20Spam%20Threshold%20to,at%20the%20'suspect'%20threshold. It is recommended t...

sysresuem by • Level 1
  • 1861 Views
  • 3 replies
  • 0 Helpful votes
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