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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

  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
  • 880 Views
  • 2 replies
  • 0 Helpful votes

HI,I've got some questions about DHAP.My question is that I see in the Mail_Logs that some SMTP servers are blocked because of the dhap_limit (which is 50) for the sender group it is in but when I look in Monitor > Incoming Mail for this spécific add...

HiI have a 4 box cluster and wish to purchase a single certificate to enable TLS useage across all 4 hosts with 3rd parties. The appliances sit behind a load balancer and NAT between 2 MX records. I believe that a wildcarded certificate is required b...

bill rice by Level 1
  • 999 Views
  • 1 replies
  • 0 Helpful votes

I confess, I'm a complete newbie as far as our C160 goes.  We had one in here months ago as a trial for outbound DLP.  When we were finished with it, since it takes months to get $$$ approved sometimes, I saved off the configuration.  I've now loaded...

phershey by Level 1
  • 3327 Views
  • 6 replies
  • 0 Helpful votes

hi,I have cisco ironport C370. we configured and try to send mail through ESMTP. I got the following errorYour message did not reach some or all of the intended recipients.      Subject:  test mail @ 3:31 PM      Sent:     1/20/2011 3:32 PMThe follow...

Hello, Cisco IronPort customers that use local AsyncOS upgrade instead of dynamic upgrades will be unable to perform upgrades at this time. We are currently working on a solution that could be implemented by early next week. Note: * By default, Cisco...

kyerramr by Level 1
  • 1201 Views
  • 1 replies
  • 0 Helpful votes

Info: New SMTP ICID 3607 interface smtp (x.x.x.x) address y.y.y.y reverse dns host y-y-y--y.zzz.zzzz.net verified noInfo: ICID 3607 ACCEPT SG None match ALL SBRS NoneInfo: ICID 3607 lostInfo: ICID 3607 closeWe try to use a mail server to do SMTP-AUTH...

What is everyone's thoughts/expierence with trying to enforce valid FROM e-mail addresses? I work for an organization of 16,000 users and currently any IT person can write a script to send e-mail FROM any address even an invalid one. The problem th...