Invalid Certificate Microsoft Outlook cannot sign or encrypt this message because you have no certificates which can be used to send from your e-mail address.

Hi,
I have a problem when trying to sign emails with an X.509 certificate in Outlook 2010. I constantly get the error message. The certificate is Verified for the email address I'm sending from.
"Invalid Certificate
Microsoft Outlook cannot sign or encrypt this message because you have no certificates which can be
used to send from your e-mail address."I have no problem with signing documents in Word 2010 with the same certificate, only when trying to send email.Every check I can perform confirms that there's nothing wrong with the certificate. Yet, Outlook still says it is invalid.I have even tried installing a second X.509 for the same email address just to check. Outlook doesn't seem to like either certificate.I know this has been posted before, but I'm completely stuck here.Thanks,~Dan

Hi,
You may have checked the option "Encrypt contents and attachments for outgoing messages" in Outlook, please uncheck this to test if the problem persists.
File -> Options -> Trust Center -> Trust Center Settings -> E-mail Security -> Clear the checkbox "Encrypt contents and attachments for outgoing messages" -> OK.
Regards,
Melon Chen
TechNet Community Support
It's recommended to download and install
Configuration Analyzer Tool (OffCAT), which is developed by Microsoft Support teams. Once the tool is installed, you can run it at any time to scan for hundreds of known issues in Office
programs. Please remember to mark the replies as answers if they help, and unmark the answers if they provide no help. If you have feedback for TechNet Support, contact
[email protected]

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