Digital ID Certs

I need to set my HR staff up to send encrypted emails on adhoc cases to any users internally or externally.  Some users are not computer savvy so they will not have a certificate.  We are not so much concerned with receiving encrypted email but are more concerned with sending out encrypted email.  We are running Exchange 2010 SP3 and Office 2010.  I had download a free certificate from symanetic but I am not allow to send it to a users because she does not have a certificate.   Is the only way to send out encrypted email is that both the sender and the receiver must have digital certificate?

I am hoping I can just send an encrypted email out to a user and be able to send them my public key.
mobotAsked:
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David Johnson, CD, MVPOwnerCommented:
since it uses public key cryptography yes both ends of the conversation require a key you encrypt with your private key and their public key and decrypt with their public key and your private key

To transfer keys one simply signs a message and sends it to the recipient and they import your public key. They sign a message to send you their public key now you are good to go.

Within an organization one can set up a Certificate Authority which the root key is trusted by everyone (via group policy)

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David Johnson, CD, MVPOwnerCommented:
I can just send an encrypted email out to a user and be able to send them my public key. Then why encrypt it? As then now anyone can decrypt it!
mobotAuthor Commented:
I thought the public key would be in one email and the second email would come across encrypted but it would only be decrypted if you received the first email with the key.
David Johnson, CD, MVPOwnerCommented:
But in order to encrypt a message that only you can decrypt I need your public key. As I use my private key and your public key.. you decrypt with your private key and my public key.  The public key is that 'PUBLIC' you can post it in twitter/facebook, put it on a website.
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