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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
  • 286 Views
  • 2 replies
  • 0 Helpful votes

Hello, we’ve recently noticed that our email are being rejected by destinations protected by Cisco IronPort. The rejection message is typically as follows:host mx1.hc268-98.eu.iphmx.com[207.54.67.223] said: 550 #5.7.1 Your access to submit messages t...

imruser by Community Member
  • 96 Views
  • 0 replies
  • 0 Helpful votes

Hi All,   Followed below document where it states need to create a message filter for header to send outbound mails. Can i know what impact if i dont create it. https://www.cisco.com/c/en/us/support/docs/security/cloud-email-security/214812-configuri...

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Vishal6 by Level 3
  • 338 Views
  • 3 replies
  • 0 Helpful votes

HII have two C695 Email Security Appliance (HA Mode). We know This Device Can Capability 10000 User. But For audit Issue I need information How many Mail can process per hour this Appliance. In Google showing : A C695 can process about 11-12 messages...

We have a nested security group (ABC)  that includes a mail distribution group (123). Would like to use this group in the incoming policy to quarantine emails for all the recipients in the organization except the members of ABC group. We want the mai...

Pravar by Level 1
  • 210 Views
  • 1 replies
  • 0 Helpful votes
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