Buy or Renew
Buy or Renew

Email Security

cancel
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for 
Search instead for 
Did you mean: 
cancel
Start a conversation

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

Start a conversation

Migrate from Secure Email Virtual C100V to Avoid McAfee-Related Issues

  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
  • 587 Views
  • 2 replies
  • 0 Helpful votes

DANE/DNSSEC logging for inbound traffic

Hello,recently there was an issue the DNSSEC settings in our DNS Zone were inactive. It was solved after a few hours. Afterwards we did get reports some (not all) external organizations were unable to send messages to our organization.Apparently some...

Siebe by • Level 1
  • 916 Views
  • 1 replies
  • 0 Helpful votes

Resolved! Can't telnet to outgoing port 25 on ESA C000V

Hi there, We are setting up the above appliance to replace a C170. At the moment it's going ok until we try to confirm the outgoing interface is accepting connections. We can telnet xx.xx.xx.xx 25 on the incoming mail port (data1) but not on the outg...

35kod by • Level 1
  • 3327 Views
  • 14 replies
  • 0 Helpful votes

Resolved! Enable TLS certificate for outbound emails in ESA

The environment has two A records which are abc.com and xyz.com. In the primary site they have two ESA appliances and DR having a single ESA appliance, for mail delivery they configured MX record as below,                  mx1.abc.com                ...

mithu by • Level 1
  • 2090 Views
  • 3 replies
  • 10 Helpful votes
Load more
Top Solution Authors
View All