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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

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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
  • 880 Views
  • 2 replies
  • 0 Helpful votes

Resolved! Email Connection Lost

Hi Community,   Below is the attached Message tracking details.   In message tracking it is showing Incoming connection has lost and the next line it is going for the next email pipeline scanning engine and at the end it started DCID connection to th...

Ali by • Level 4
  • 9611 Views
  • 3 replies
  • 0 Helpful votes

BlockSpoofing

Hello We have cisco email security C190 appliance we want to block or reject any mail coming from internet which as our SMTP domain in sender email ID, suppose we have our SMTP domain is "mydomain.com" so any incoming mails from internet which has se...

Email Security- Virtual

Hi.. I am planning to deploy email security solution on vmware but our organization email accounts are on Microsoft exchange online(cloud) which way should i setup email security solution, will this solution work with this structure. Please suggest.

Anukalp S by • Level 1
  • 1009 Views
  • 1 replies
  • 0 Helpful votes

Blocking Indication Spam

Haloo, I have small problem, about email spam like accountss@6f269e243ba53ab9d4f7ca5b2d7e02d6.abcdefg.com. Can i change 6f269e243ba53ab9d4f7ca5b2d7e02d6 to *, worried more name different with same .abcdefg.com. so blocking will be using name @*.abcde...

Resolved! Safelist/Blocklist syntax

Hi, what is the correct syntax for recipient address in SL/BL? I tried to set Sender: testsender@testdomain.com Recipient: *@mydomain.com It's accepted but it doesn't work. When I tried Sender: testsender@testdomain.com Recipient: myname@mydomain.com...

flyok by • Level 1
  • 3264 Views
  • 6 replies
  • 0 Helpful votes

Reply to secure email caught in our SPF-Fail quarantine. Whats ALL the CRES servers so I can whitelist?

We just started having a problem with a vendor who replies to our Cisco CRES secure emails.  When they do this the emails come from a Cisco server, 184.94.241.96 mxnat1.res.cisco.com but the mail from indicates its from the actual company we are comm...

Config change log in Ironport

I want to know the configuration changes made by user(admin) on Ironport mail gateway. I do not want to depend on users comment in change but want to find out actual change log. which can give what was changed. Please let me know if they is any way t...

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