Why can I read encrypted emails (Outlook) from some users but not others?

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I just received a new computer ID card with encryption keys, which I published to my organization's GAL. I can send encrypted emails just find. However, when someone tries to send me one, I can read them from half of the others successfully, but the other half result in the "Your digital ID name cannot be found by the underlying security system" message box.

Why wouldn't the problem be "all or nothing"? I am running Office Professional Plus 2016.

Don Del Grande

Posted 2019-10-08T21:23:37.130

Reputation: 1

What does your CSA believe is the problem? You have both the old and new public key installed on your system? (I am extremely familiar with this subject, every single one of my emails at work, is digitally signed and can be encrypted) – Ramhound – 2019-10-08T21:35:18.557

1https://knowledge.digicert.com/solution/SO4972.html – Moab – 2019-10-08T21:44:44.090

1"The sender of the encrypted email used a public key to encrypt the email for which you do not own the private key needed to decrypt." - What this means is that the sender used your OLD public key, since that no longer is installed automatically by Windows (when you insert your smart card), you will have to go through the recovery process to get that old certificate. There is a process for that, right, otherwise, you can't open ANY old encrypted emails when that certificate was being used. (again I have knowledge as a user (and Admin) on this subject) – Ramhound – 2019-10-08T23:33:10.600

No answers