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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

Hello, I noticed on my ESA there are two choices for File Reputation Server in the Americas.  Which one is the prefered one we should use? AMERICAS (cloud-sa.amp.cisco.com)AMERICAS (Legacy) (cloud-sa.amp.sourcefire.com) Thanks!

Hello! I have one ESA 300v virtual appliance, AsyncOS version 11.0.Customer needs fault-tolerant configuration before testing it in production environment. I am a little confused about HA concept of ESA operation.1) What is clustering from ESA perspe...

I am going to whitelist couple of IP addresses under WHITELIST sender group of Email Security Appliance for incoming emails. Please find the attachment and let me know does this configuration per hour. Also, please confirm on maximum messages (300 * ...

TRUSTED - Mail Flow Policy.png
pbabu6001 by Level 1
  • 1707 Views
  • 1 replies
  • 0 Helpful votes

I'm running my own mail server. Unfortunately i'm experiencing delivery problems whenever i try to send mail to organizations that use IronPort. My logs indicate that the messages are sent and accepted, but they are never delivered to the mailbox of ...

I am trying to replicate an issue that we have on inbound mail that arrives with content-type us-ascii.  I want to replicate this problem so I have have created a filter that will be applied to emails arriving from a particular user and applies the f...

Hi We are using Cisco ESA with AsyncOS 9.7.1-066 and I have to force TLS inbound/outbound for many email domains. TLS configuration is fine and working, but currently I have to: - Add a new line in destination controls with the email domain to have ...

Hi Team, We have customer using ESA C370 for email security and currently have 2 GB RAM installed, need your advice how to upgrade the RAM to 8 GB. Let me know how can we order the upgrade kit and the necessary part code for the same. Kindly advise.

ymadheka by Level 4
  • 1356 Views
  • 4 replies
  • 0 Helpful votes

I need to modify the following regex for our message filter that block spoofers but not sure how to form the regex.   It seems that Cisco regex is a bit different then regular regex?  is there a site I can run tests?  I've tried "https://regex101.com...

jtsai8585 by Level 1
  • 2108 Views
  • 8 replies
  • 0 Helpful votes

Resolved! Iron Port Query

Hi, we use Cisco C170 (Iron Port) device as our email gateway.We have an enquiry from our IT security team: does Iron Port share / aggregate our email / browsing behaviors outside our network, for analysis purpose e.g. Could someone please advise? Th...

Hi88 by Level 1
  • 2002 Views
  • 4 replies
  • 0 Helpful votes