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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
  • 1158 Views
  • 2 replies
  • 0 Helpful votes

Hello - I'm working on an ESA C170, firmware version is 11.0.0-274. Troubleshooting a 2-5 minute inbound mail delay.Below is an example log entry, message arrives at 11:09:33, and is sent to the mailbox at 11:11:16. Seems like the delay is due to the...

stimike by Community Member
  • 2205 Views
  • 4 replies
  • 0 Helpful votes

Greetings!I would like to ask about perpetual feature key(Incoming Mail Handling, Bounce Verification). What kind of the email security appliance functionality does each key permits? Actually I am interested in the masquerading and domain mapping fea...

Hi I'm new to regex.How to add a condition in a filter to block emails with similar text in the subject:Nancy Reardon sent you "PO-09507.pdf"Andrew Beverley sent you "PO-124.pdf"larry noble sent you "PO-110.pdf"Tony Flinn sent you "PO-09522.pdf" 

jackey.fung1 by Community Member
  • 1469 Views
  • 1 replies
  • 0 Helpful votes

Hello experts,We are successfully marking external emails with the [EXTERNAL] tag for emails unless the email is in plain text. Is anyone else having this issue?Thanks.Update: Thanks for the walk through.  I'm going to check with our email team to ma...

jboudi by Community Member
  • 1770 Views
  • 3 replies
  • 0 Helpful votes

Hello, I wanted to ask a question regarding Cisco SMA message tracking in my customer environment. In the ESA, we have 2 outgoing policies, whitelist and blocking policy, and the email is sent to multiple recipients which splintered the message to bo...

Is it possible to use wildcards/regex in SLBL? Like, for example, allow all senderdomain.com to be safelisted for all my users of recipientdomain.org  

Crovax by Level 1
  • 3419 Views
  • 5 replies
  • 0 Helpful votes