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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
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  • 2 replies
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With all the phishing emails going on, we have been hit at least weekly for the past 2 months, I'd like to create an Incoming Content Filter to quarantine these. From looking at the messages they all seem to have the word "password:" on a line by its...

oh_ironport by Community Member
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Hi Guys, Can someone advise me on what these error message means on ironport ?What was the cause?Final-Recipient: rfc822;validuser1@domain.comAction: failedStatus: 5.0.0 (permanent failure)Remote-MTA: dns; [ironport's ip address]Diagnostic-Code...

Hi,I have a C350 running on 6.0.0-745 and just received a second box to make a cluster. The new box runs on version 5, but can't get upgraded to 6.0.0-745. 6.0.0-746 or 6.0.0-747 are the only choices. Is there a way to get the 6.0.0-745 image? I can'...

Guys , we have many systems with many end users and upgrades on the slow links are a big nightmare , what we did we followed the article on support site and downloaded releases manually using one of the serial numbers and following the url link answe...

What does it mean:deliver mail from', '<daniela> to <dkoleva>. Please try', 'later.']) []Mon Apr 7 12:18:06 2008 Info: Delayed: DCID 1637258 MID 2659459 to RID 13 - 4.1.0 - Unknown address error ('451', ['82.119.76.141 is not yet authorized to deliv...

Hi there, I have been trying to logon to MFC all morning, I am able to put in the username and password, but then it just sits there and does nothing. I bounce the server it resides on and try again...it lets me in, I click to access another page and...

Hi all,I have setup some content filters on our C300 appliance.One of the filters checks for attachments of type media and puts the email into a quarantine area.Another filter checks for attchments of type image and sends a notification to the recipi...

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