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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

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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
  • 358 Views
  • 2 replies
  • 0 Helpful votes

Spoofed SPF Headers

Does Ironport strip existing SPF headers from incomming messages?SANS Diary today had an interesting article by Johannes B. Ullrich, Ph.D. titled "UPS Malware Spam Using Fake SPF Headers". https://isc.sans.edu/forums/diary/UPS+Malware+Spam+Using+Fake...

bnklein by • Level 1
  • 1125 Views
  • 1 replies
  • 0 Helpful votes

Resolved! centralized spam quarantine on M670.

Hi guys , I am currently running centarlized SPAM quarantine on my M670, but once i try to access the quarantine on the M670 it returns a page with this error "PAge cannot be displayed."I have also enabled  end user access to read /release their spam...

GKaingana by • Level 1
  • 1211 Views
  • 1 replies
  • 0 Helpful votes

Ironport Email Security Appliance query

Hello,How we can achieve the below requirement on Cisco ESA using message filter.1.) Emails should only be sent from one specific source,  with the below mentioned attachment format and attachment type of .pdf or .png only2.) Emails should only be se...

forticis by • Level 1
  • 910 Views
  • 1 replies
  • 0 Helpful votes

Report for failed delivery with reasons

Hi all,Maybe i am blind, but I cant find a way to do an automatic report or email a report for bounced emails with details.So I need to get a report with the email address, message number and the reason for the bounce or failure for Example: bounced ...

Envelope Sender: (no sender)

Many mails of my ironport is showing as hardbounce & softbounce. When i check the message detail for every mail it is showing no sender in envelope sender and most have the subject as undeliverable message.why this mesage are generating, how do i res...

Ironport C150

Hi all,I'm hoping someone can help with the following issue I'm having? It relates to an Ironport C150 where the automatically generated and emailed reports now no longer contain any information. The following error message was received in an alert e...

petervans by • Level 1
  • 2870 Views
  • 8 replies
  • 0 Helpful votes

Resolved! problems with other messages

Hi, Ironport sent a message to one of my users, about that his message was put in quarantine, my colleague forward this letter to me, and i can control his safelist and blocklist in his Spam Quarantine through this letter.How can i fix it?

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