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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
  • 876 Views
  • 2 replies
  • 0 Helpful votes

Hi everybody,I have a unique requirement for my outgoing mail. people in my organization sending mails to hotmail,yahoo or gmail accounts large attachments which is obviously non business mail, with multiple recipients which clogs over 2MB pipe. We a...

Hello all,Not sure if this is every company, but we have pretty strict rules for SSN's. We use the C150. We have the following rule to catch the main SSN offensives and this works very well. ssn: if (recv-listener == 'OutboundMail') AND body-cont...

jwiegert1 by Level 1
  • 1525 Views
  • 3 replies
  • 0 Helpful votes

I've just deployed 2 C160's in Cluster. All is goodBUTI have IBM enterprise racking and the racks have round holes !Does any one know what happened to the Round hole Racking Kits ?If not then I believe the hardware is Dell based thus what Dell Kit wo...

I have two C600s using Centralized Management. One has Cluster Communication Service active on port 2222 and the other does NOT have Cluster Communication Service active. Both appliances do have SSH enabled on port 22. Centralized Management is w...

We were recently hit with a large number of mails in the active recipient queue due to one of our customers being exposed as an open relay, in a nutshell we sat with just over 100 000 mails in the queue destined for Russian domains .ru.I was surprise...

A pdf preview in the 'Domain-based Executive summary' shows me a 'No data found' in the 'Outgoing Mail Summary' / 'Outgoing Mail Graph'. But the reporting data is available on our M650 (v6.4.0).I added individual internal domains (customer1.com, cust...

tehweiner by Level 1
  • 983 Views
  • 1 replies
  • 0 Helpful votes

Hello,I don't believe this is possible because of the email workflow but I want to cover all bases.Here is the scenario:- We have 2 IronPort C350's. I have one that handles all normal outbound mail flow and the other handles CRE encryption as well as...

hi... can anyone point out what ive been missing here?i got an error on the ff:(DCID 563035) Message 1336940 to name.surname@mydomain.com bounced by destination server. Reason: 5.1.0 - Unknown address error ('550', ['<name> Relaying denied'])Please h...