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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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Hi,I'm in the process of setting up a C350 for the first time, and can't seem to get delivery success notifications to work. I can only find options for soft/hard bounces (which are working) but can't find any options for success notifications. Our o...

I have configured our LDAP and turned on the quarantine access for users.I have tested and it works! Yeah..... well for people on the same subnet as he C300.The C300 is on a 10.x.x.x subnet and so is everyone at this location but those that are on th...

We prepend the subject of positively identified spam with [SPAM+] and have been doing so for years. Each user has a rule setup that moves anything with [SPAM+] to their 'Junk E-mail' folder. This system has worked well for years.About 2 months ago,...

Hi, does it really need to create another mx record for ironport ? the secondary mx record would be the mail server...any recommendations or best practices that you can offer?thank you.kira

Hello Nation,Have any of you looked already looked into the new "Image Scan" functionality of Async OS release 6.3?If so, what are your experiences? (Mainly: what system recourses does it consume)The function sounds very promising, I'm curious....Ste...

My company wants to provide a way for external users to send secure mail to us. My understanding is that the IronPort Secure E-mail solution is only for Outgoing mail, is that true?If so, what are some of the solutions that we could/should evaluate...

Our C 600 hasn't been updated in a while because of job reasons. So we updated to version 5.5.1 - 019 of Async OS on the 28th. We also use Whats Up Gold to monitor our network devices. After the update process, now the SMTP service on the Ironport is...