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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
  • 1515 Views
  • 2 replies
  • 0 Helpful votes

Hi   We have ESA C190 and two different exchange organization ( two AD forests) like   1.Forest   "abc.local" with DC (abcdc01 and abcdc01) 2. Exchange  smtp domain "abc.com"   1.Forest  "xyz.local" with DC (xyzdc01 and xyzdc02) 2. Exchange  smtp dom...

I've seen the option  encrypt passpharses in the configuration file within AsyncOS's system-administration. There is no documentation about how passwords are stored, and how they are encrypted (which password, cert, what ever). Any informations?

Linz by Community Member
  • 1886 Views
  • 2 replies
  • 0 Helpful votes

Hello guys, I have read that by RCP standard it is not possible to detect BCC fields with ESA, because they are known only to first Mail relay server and after ESA gets it, it already has that BCC info as 'RCPT'.However, why does Outlook see the RCPT...

darkw1y by Community Member
  • 1356 Views
  • 0 replies
  • 0 Helpful votes

Hello,I am getting a few errors each day related to the following type of message.  I have done some web searches, and a few pointed to Windows 2008 DNS as a possible problem.  However, our Ironports point to our external DNS which is BIND.   Here is...

Hi, I have a Mail policy to whitelist list of identified senders, to skip spam, virus & Graymail verifications. Recently, my company decided to use Pardot application, to send newsletter campaign. Users asked me to whitelist the address, because they...

spepin001 by Visitor
  • 2139 Views
  • 2 replies
  • 0 Helpful votes

I upgradedmy Ironport C170 Cluster nodes to 11.0.0 from 10.0.2 and now I cannot join one of them back to cluster because I get the follwoing error Machine mail.paytel.com (Serial #: 5057A8E1FEB6-FTX1621M01Q) -disconnected: mail2.paytel.com -> mail.pa...

Looking to confirm that a customer could deploy Cisco cloud email security and utilize Zix for email encryption service (either deployed on prem or in cloud). If possible - are there any limitations around this that  be aware of?The question was spec...

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