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I am unable to send encrypted messages to others in Outlook 2010. I get the following error:
"Microsoft Outlook had problems encrypting this message because the following recipients had missing or invalid certificates, or conflicting or unsupported encryption capabilities:"
The recipient is in my contacts list and has a digital ID/certificate. I have explicitly trusted this certificate. When I made the email I filled the "To:" field using the exact contact from the Contacts list.
If I right click on the recipient and choose "Lookup Outlook contact", their card comes up. If I then select "Certificates", it shows the certificate for the recipient and it is a valid and up-to-date certificate. I am able to send encrypted messages to myself.
How can I find out the precise problem that is causing the error?
Did you ever solve this? If so, how? If not, does wiping out the email address in the To field and retyping it in work for you? I have the same issue and that's what I have to do... – TTT – 2014-06-04T02:46:00.497
I sort of solved this problem by getting a special kind of certificate called a "PKI", then I had to go to this special Department of Defense site and download ALL of their authority thingies, which took a long time. After that I could do it. It was a true pain in the ass. – Tyler Durden – 2014-06-04T02:49:34.913