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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.

 

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Migrate from Secure Email Virtual C100V to Avoid McAfee-Related Issues

  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
  • 1502 Views
  • 2 replies
  • 0 Helpful votes

Resolved! Email Size Modification

Hi Cisco Support,   Can ESA changes/modify the email size from default email size of 10MB per email will be changes to 11MB+ or more?  I tried to changes/modify the email size under the outgoing mail policy from default of 10MB to 25MB and 30MB, and ...

Certificate Private Key

Hello,   I've created self-signed certificate and has been signed by trusted CA, and I applied the Inbound and outbound TLS successfully.   Now, I want to copy the Private Key, but I don't know the location of the file. Can someone give me advise whe...

rab ngl by • Frequent Visitor
  • 3303 Views
  • 1 replies
  • 0 Helpful votes

Partially Open Relay

Hello,   My mail gateway has been found as partially open relay.   The proof of concept below --begin telnet mail.domain-x.com 25220 mail.domain-x.com ESMTPMAIL FROM: test1@domain-y.com250 sender <test1@domain-y.com> okRCPT TO: test2@domain-x.com250 ...

rab ngl by • Frequent Visitor
  • 3585 Views
  • 7 replies
  • 0 Helpful votes

Resolved! Upgrade cluster with two node

Hello, I just want a clarification regarding the upgrade of ESA in a cluster environnement. We have 2 C370 in cluster. Here's my action plan Connect on Appliance1 Suspend Listener  Disconnecte Appliance1 from cluster Upgrade & Reboot resume listener ...

Encryption too weak...

Hi,   Since few days, one of our partner couldn't send us any mail. Senders use to receive back this erreor : Remote Server returned '< #5.7.0 SMTP; 503 5.7.0 encryption too weak 0 less than 128>' I checked my settings in my Ironport server, but I di...

spepin001 by • Visitor
  • 5170 Views
  • 4 replies
  • 0 Helpful votes
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