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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
  • 1500 Views
  • 2 replies
  • 0 Helpful votes

We use cisco anyconnect vpn on ASA 5525-x.Two days ago we found out in ASA logs something like a brute force attack:---6|May 31 2021|08:35:34|725007|193.27.228.247|60734|||SSL session with client outside:193.27.228.247/60734 to a.a.a.a/443 terminated...

nkmz by Visitor
  • 15278 Views
  • 9 replies
  • 11 Helpful votes

Hi,We have 2 virtual appliances of ESA in cluster which on the initial installation was configured with only 1 ethernet interface. Now I want to add second interface to use it only for management. I have added the second interface from the hyper-viso...

bsam by Community Member
  • 2531 Views
  • 4 replies
  • 0 Helpful votes

We are trying to install SSL cert on our Ironport C170We have the cert ready in pkcs#12 formatWhen we try:Network->Certificates->ImportIt loads OK but then says url not found:/network/certificates  Help much appreciated !UDI: C170 V06 FTX2044Y56FName...

tipper by Community Member
  • 1075 Views
  • 3 replies
  • 0 Helpful votes

Hello,One of our clients is getting rejected by iphmx.com - they have an on prem exchange server, are not on any black lists, and everything checks out on their end; its only mail going through the iphmx filter that are an issue, so it affects anyone...

NSDinc by Community Member
  • 42005 Views
  • 6 replies
  • 0 Helpful votes

Hello,Successfully downloaded AsyncOS 16.0.0 build 054 and while trying to install this upgrade following error pops out. How to troubleshoot this problem?I've tried restarting the tracking service from CLI (diagnostic > services)The following errors...

Giorgi007 by Frequent Visitor
  • 2710 Views
  • 4 replies
  • 0 Helpful votes
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