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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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We've recently encountered a problem where e-mails are sporadically being bounced with a Reason: 5.1.0 - Unknown address error ('500', ['Firewall Error']) error. What makes this hard to troubleshoot is that it's sporadic. Any ideas?Rob

systems by Level 1
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Hi allThis is probably not directly related to IronPort, but I'm sure you guys might be able to help.We installed an IronPort applicane a few months ago and everything works great. Unfortunately, we forward the mails to our internal sendmail server w...

We have several content filters setup on an incoming policy. Profanity, Image Sanning and account numbers.We get a lot of news letters that are quarantined by these filters (mainly profanity).I am compiling a list of sender addresses in a dictionary....

Hi,Our C150 running 6.4.0-273 switched off on its own today, and we have no idea why. When we switched it back on again, it worked fine and so far no problems. It's been running perfectly normal for a long time (many months) and we've never had this ...

I have a chance (If I choose) to attent the Ironport C Series 2 day training. ... Is it worth it? We have an issue that keeps getting us blacklisted because of a mailbot. Getting into my Ironport which is set up with the basic config using ldap looku...