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...
Email Security
Turn on suggestions
Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.
Showing results for
- Cisco Community
- Technology and Support
- Security
- Email Security
Options
- Mark all as New
- Mark all as Read
- Float this item to the top
- Subscribe
- Bookmark
- Subscribe to RSS Feed
- Threaded format
- Linear Format
- Sort by Topic Start Date
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.
Labels
-
Appliances
(1) -
Buying Recommendation
(5) -
Cisco Bugs
(14) -
Community Feedback Forum
(3) -
Community Ideas
(1) -
Email Security
(6,404) -
Network Management
(1) -
Other Community Feedback
(1) -
Other Network Security Topics
(1) -
Policy and Access
(1) -
Security
(2)
Forum Posts
Hello, I already assigned lower specification for virtual cisco SMA on Microsoft hypervisor. i need to assign higher resources for the SMA. what is the best practice steps to this.
Hello all, Currently building replacement fresh ironports in response to CVE-2025-20393 The new VM I've deployed - phoebe-16-0-1-017-C300V - is EXTREMELY slow on boot. This is the first 2h the thing has been online and I can't even use the GUI becau...
Issue Description:When users attempt to open the securedoc.html file using the default Cisco Secure Email Encryption link, the secure portal fails to load and displays a “System Unavailable” error. The issue is consistent across browsers, devices, ne...
Dear Cisco Secure Email Threat Defense Team,We are facing an issue where a SharePoint folder sharing email is being blocked and marked as a scam due to a retrospective verdict.Details:Message ID: <Share-3d3ce3a1-a014-6000-40fe-b8bee2adf36e,3d3ce3a1-a...
Hey, i have a cloud deployed c100v esa that is in production with 1 listener.is there a relevant guide about how can i change the config to multiple listeners without configuring everything from scratch?
Hi all,got a problem with DKIM-Signature-Validation in our ESA (Cisco C695 with AsyncOS 15.5.3 build 024).Signature validation fails, if domain in DKIM-Header's d-tag is uppercase. For example, an email with these HeadersFrom: XXXXXX@GMX.DEDKIM-Signa...
While trying to renew our TLS Certificate we always receive the following error message when trying to submit it:Validation Error : Certificates signature verification failedWe uploaded a PFX (PKCS#12) certificate which contains the certificate chain...
How can i perform periodic backup for both ESA and SMA without these scripts. https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/118403-technote-esa-00.html https://www.cisco.com/c/en/us/support/docs/security/secure-email-ga...
Can i use the display name of the email address to block specific user in mail policies ? (ex. cris mateo instead of cris_mateo@cisco.com )
Helloi Netpros, working on a hybrid Exchange setup (on-prem Exchange + Microsoft 365) and want to route outbound mail from Microsoft 365 through our Cisco ESA, so all outgoing messages pass the same filtering and logging as on-prem mail. Inbound mail...
Resolved! Maximum allowed message size for S/MIM
Hello Asyncos Version: 16.0.3-044we get an message:"(DCID 327372) Message 16998928 to info@xxxxx.de bounced by destination server. Reason: 5.x.0 - Message bounced by administrator (This message is larger than the maximum allowed message size for S/MI...
Dear all,I would like to clarify the behavior of Cisco ESA devices regarding configuration synchronization when they are reconnected to a cluster after a successful upgrade.Assume we have seven ESA devices that we plan to upgrade over a two-week peri...
Hi I have created a user in secure email cloud gateway ,and I need to share login details along with link to access, where can I find?, help me with the path please
i am facing login issue it says that account is locked and most of the time password or username issue
An o365 mailbox user found a type of emails move to Deleted Items when received. After studied the audit log found the emails were moved by Cisco Secure Email Threat Defense. How can I fix this issue? Where can I submit this info to Cisco further inv...
Learn, share, save
Discover and save your favorite ideas. Come back to expert answers, step-by-step guides, recent topics, and more.
New here? Get started with these tips. How to use Community New member guide
Unanswered Topics
| Subject | Author | Posted |
|---|---|---|
| 03-05-2026 01:59 AM | ||
| 02-17-2026 09:35 AM | ||
| 01-19-2026 10:17 PM | ||
| 12-20-2025 01:25 AM | ||
| 11-29-2025 12:18 AM |
New solutions