Views:

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:

On Outlook 2007, go to Tools > Trust Center > Add-ins.
Select Exchange Client Extensions from the Manage dropdown list, and then click Go.
Make sure that the following options in the Add-In Manager window are enabled:
- Private Post Attachment Handler
- Private Post v4
Click OK.
Restart Outlook.

Keywords: cannot send encrypted email,unable to send encrypted emails,error in sending encrypted mail

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

Product / Version includes:

Last updated: 2021/08/28

Solution ID: KA-0001958

Category: Troubleshoot

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

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:

On Outlook 2007, go to Tools > Trust Center > Add-ins.
Select Exchange Client Extensions from the Manage dropdown list, and then click Go.
Make sure that the following options in the Add-In Manager window are enabled:
- Private Post Attachment Handler
- Private Post v4
Click OK.
Restart Outlook.

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