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"The message could not be sent securely" appears when sending an encrypted email

    • Updated:
    • 22 Aug 2016
    • Product/Version:
    • Encryption for Email 5.7
    • Encryption for Email 5.8
    • Encryption for Email 5.9
    • Platform:
    • Windows 2000 Advanced Server
    • Windows 2000 Datacenter Server
    • Windows 2000 Professional
    • Windows 2000 Server
    • Windows 2000 Small Business Server
    • Windows 2003 Compute Cluster Server
    • Windows 2003 Datacenter Server
    • Windows 2003 Datacenter Server Edition 64-bit
    • Windows 2003 Enterprise Server
    • Windows 2003 Home Server
    • Windows 2003 Small Business Server
    • Windows 2003 Standard Server Edition
    • Windows 2003 Standard Server Edition 64-bit
    • Windows 2003 Storage Server
    • Windows 2003 Web Server Edition
    • Windows 2008 Datacenter Server
    • Windows 2008 Datacenter Server Edition 64-bit
    • Windows 2008 Enterprise Server
    • Windows 2008 Enterprise Server Edition 64-bit
    • Windows 2008 Essential Business Server
    • Windows 2008 Small Business Server
    • Windows 2008 Standard Server Edition
    • Windows 2008 Standard Server Edition 64-bit
    • Windows 2008 Storage Server
    • Windows 2008 Web Server Edition
    • Windows 2008 Web Server Edition 64-bit
    • Windows 7 32-bit
    • Windows 7 64-bit
    • Windows Mobile 5 Pocket PC
    • Windows Mobile 5 Pocket PC Phone Edition
    • Windows Mobile 5 Smartphone
    • Windows Mobile 6 Classic
    • Windows Mobile 6 Professional
    • Windows Mobile 6 Standard
    • Windows NT 4.0 Server
    • Windows NT 4.0 Workstation
    • Windows Vista 32-bit
    • Windows Vista 64-bit
    • Windows XP Home
    • Windows XP Professional
    • Windows XP Professional 64-bit
Summary

When you try to send an encrypted email using Trend Micro Encryption for Email (TMEE), the following error message appears:

The message could not be sent securely

Details
Public

The error occurs when the following plug-ins are disabled or not installed in Outlook:

  • Private Post Attachment Handler
  • Private Post v4

To resolve the issue:

  1. On Outlook 2007, go to Tools > Trust Center > Add-ins.
  2. Select Exchange Client Extensions from the Manage dropdown list, and then click Go.

    Exchange Client Extensions

  3. Make sure that the following options in the Add-In Manager window are enabled:
    • Private Post Attachment Handler
    • Private Post v4

    Add-In Manager window

  4. Click OK.
  5. Restart Outlook.
Premium
Internal
Rating:
Category:
Troubleshoot
Solution Id:
1056951
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