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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
  • 876 Views
  • 2 replies
  • 0 Helpful votes

Increased malware in DOC macros

Good Morning, We are currently seeing a massive increase in malware contained in Word Document macros, these are dropping through the ESA until CASE catches up, and there are no AV signatures for these files at the time of drop.I've analysed these fi...

Cisco vESA updates

Hi I migrated from C170 to C100v, I have problems with antispam updates, according to document: http://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118065-maintainandoperate-esa-00.html I should change dynamichost to: update...

Resolved! Undeliverable: - Cisco C170 - 5.4.7 - Delivery expired (message too old) [Default] '[Errno 54] Connection reset by peer' (delivery attempts: 75)

Users just started having issues sending group emails of 10 recipients or more to outside email addresses. Internal emails working fine. But any going to outside address like gmail, yahoo, hotmail and others all come back Undeliverable 5.4.7... They ...

mattmolloy by • Level 1
  • 15071 Views
  • 7 replies
  • 0 Helpful votes

Blocking rar in ESA

Hello, I've created a content filter to block rar file.I've tried to use this conditionsAttachment File Info / Filename: Ends with .rarAttachment File Info / File Type is rarWith Action as Quarantine / and notify User=> The attachment is still going ...

REJR77 by • Level 1
  • 977 Views
  • 2 replies
  • 0 Helpful votes

Resolved! After upgrading to ESA 9.6: SSL routines:SSL3_GET_CLIENT_HELLO:no shared cipher

Hi After upgrading to ESA 9.6 all email from google/gmail failed with "SSL routines:SSL3_GET_CLIENT_HELLO:no shared cipher" in the log. In the config i have "RC4-SHA:RC4-MD5:ALL" ciphers. This is the default settings, since I never have changed anyth...

Resolved! URL Filtering

When enabling URL Filtering, will this be used by the Anti-Spam engine to catch additional spam based on url reputation, or does it only work with Outbreak filters and any custom content filters created?

does Ironport replication automatic?

Dear allI have 2 Ironport (main and backup) Web ESA-C170-K9 and 100 ESA-ESI-LIC= that i will configurreI want to know if configuration replication is automatic; do i need to configure each applicance or is it possible to do all configuration in the m...

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