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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

A security professional recently suggested that we created an "extensions allowed" list in our Spam appliance instead of an extensions blocked list. Has anyone done this before and if so what is the best way to accomplish this? 

hi. yesterday i entered adobe.com and tried to login. but i forgot my password so i tried to recover password. i clicked "Recovery password" and it said it has sent recovery link to my corparate email. but i see nothing in email logs (monitoring trak...

Hi,Long time ESA appliance administrator for our company  that needs some help. I read through the guides but still am not clear on what to do. We are using an ESA C195 for inbound and outbound filtering of our Exchange 2016 on-premise server.So, I n...

Hello,Please see below, i created a filter under content filtering to block any incoming email that has an HTML attachment.  it's now for some reason blocking a lot of emails from many senders. although they are either allowed senders or just the bod...

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Hello,In the past, we were told by Microsoft 365 to allow an IP range. We were told that we have to have 40.107.0.0/17 in our allowed list. However, every 2-3 days we receive SPAM emails and when we investigate the issue on IronPort we notice that th...

Hello everyone,we´re currently searching a opputinity to handle massmaling.The goal is simple: send this mass mails out from a different interface.We have already the following Mailfilter:HighRiskDelivery-Massmail: if (rcpt-count > 20) AND (NOT (rcpt...

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