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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
  • 869 Views
  • 2 replies
  • 0 Helpful votes

HI Team,   I would like to have confirmation that is there is compatibility issue with NTLMv2 on Cisco IronPort ESA and my i have any configuration guide or steps for the same.   I believe NTLM configuration is more in WSA than ESA. So i just wanted ...

prparava by Cisco Employee
  • 1771 Views
  • 1 replies
  • 0 Helpful votes

Hello all, Is it possible within the email Message Tracking to filter based on which Mail Policy a message hit? There are lots of filters available, but I can't seem to find one that does this. I'm trying to cleanup our Mail Policies, as we have seve...

charlesgp by Level 1
  • 1007 Views
  • 1 replies
  • 0 Helpful votes

Email users received spam email, directly to the inbox, iron port URL scanning display the below message 06 Feb 2019 06:55:15 (GMT -05:00)06 Feb 2019 06:55:15 (GMT -05:00)06 Feb 2019 06:55:15 (GMT -05:00)06 Feb 2019 06:55:15 (GMT -05:00)06 Feb 2019 0...

I have worked on the configuration of ESA to add a disclaimer on all inbound email that states the following:   [CAUTION] This email originated from outside of the exemple.com domain. Do not click on any links or open any attachments unless you t...

lm20ele by Level 1
  • 1329 Views
  • 1 replies
  • 0 Helpful votes

We are finding that in Outlook (Office 365) we install the plugin, verify the encrypt button works and send an encrypted message although the recipient is getting the message completely UNENCRYPTED. Is this a known issue? Is there a different pluging...

dfiore by Level 1
  • 1272 Views
  • 2 replies
  • 0 Helpful votes

Supposing that just Office 365 premium protection will be used, does the L-CES-O365P-1Y-S2 license is enough to protect Office365 email for 400 users? or is it necessary some additional license? Thank you in advanceCES

fcout by Level 1
  • 2143 Views
  • 1 replies
  • 0 Helpful votes

Resolved! Csico DLP

Dear all,We are working with Cisco Email and web-security appliances and we are in the process to implement a DLP solution as part of our security portfolio.Thus, we are wondering what can Cisco offer in this regard and whether we can use the current...

learnsec by Level 1
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  • 4 replies
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Hello!   I use SMA and WSA appliances. If the connection goes down between the WSA and SMA what is happening with the WSA reports and tracking events? Are these events synchronized to the SMA after the connection repaired?   Thanks! Zoltan

In working with a customer, their design uses a pair of C690 ESA appliances with an interface for the DMZ and one internally in a global pool.  They only would like external bound email to be masqueraded and all other internal domains will be routed ...

jbilder93 by Level 1
  • 2491 Views
  • 0 replies
  • 0 Helpful votes