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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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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
  • 432 Views
  • 2 replies
  • 0 Helpful votes

Office 365

What is the best way to forward incoming mail from my C170 IronPort to my Office 365 Account so that emails are filtered etc. before they hit 365

Ironport Outlook Plugin Reply Encrypted Email

I would like to clarify whether Ironport Outlook plugins can (with flag mode) reply a "reply-message" originated from external CRES user.Here is a situation:- 1. Corp User A compose an encrypted email to external user B2. External user B receive this...

wayneso by • Level 1
  • 1055 Views
  • 2 replies
  • 0 Helpful votes

Resolved! Inbound filters, drop if can't check

The ironport has a number of Security features. Where do we configure what do to if the filter in question (anti-virus, whatever) fail to examine an Attached file? We want the ironport to drop the email if the Attached file is unscannable.

bvj197222 by • Level 1
  • 997 Views
  • 1 replies
  • 0 Helpful votes

Resolved! Cisco Iront Port C370D: IP SBRS -4.0 but is still listed in WhiteList Sender Group in HAT Listener !

Hi everybody, my system is facing a problem now when some IP address has very low Sender Base Score but instead of considering it in a BLACKLIST Sender Group, Iron Port C370 is considering that Sender IP as in WHITELIST Sender Group and Accept the SM...

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