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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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Ironport c160 cluster problems

Hi!I have two Ironport C160 in cluster mode, tonight one of them has stopped working, and I can not access this on, but it responds to ping.In the system log I found only the following line:Mon Mar 12 15:30:39 2012 Warning: Error connecting to cluste...

C160 ironport - restricting SMTP

We are using SMTP on the ironport for inbound and outbound mail.   An SMTP route exists for the receiving domain and the Destination is the Mail Server IP, so all SMTP inbound messages route to the Mail Server.  Outbound messages also go through the ...

Using syslog UDP connection errors

We recently implemented a syslog UDP delivery of several of our ESA logs to our security group for evaulation.  We are consistently getting this error message regarding these deliveries.  UDP should be basically be a blind connection - why would the ...

Resolved! IPv6 capability

Hi,We were told by our sales rep that the next OS release will be IPV6 compliantOver the weekend we upgraded our incoming mailscanner C370 to a new version which is version 7.5.1-102How can I confirm whether this current release is IPv6 compliant? Be...

Suspected Spam Rating

We are getting a lot of phishing email and email with malicious links.  We are bringing down our suspected spam level to 30 to see if that will help.It would be nice if like the SBRS, we could get a spam rating on the email so that we could guage our...

Cannot send to domain

We have an IronportC160 that cannot send to lasllc.net. When anyone (three different senders). Sends an email to this domai, the log shows lookup an virus scans good, the message is queued for delivery. Three days later the log shows a delivery at...

Ask the Expert: Best Practices for Configuring the Email Security Appliance

With Woody HardisonWelcome to the Cisco Support Community Ask the Expert conversation. This is an opportunity to learn from Cisco expert Woody Hardison  about Cisco e-mail security appliance, configuration of the HAT, anti-spam, anti-virus and how t...

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