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Microsoft Outlook had problems encrypting this message because the following recipients had missing or invalid certificates, or conflicting or unsupported encryption capabilities.

Microsoft Outlook had problems encrypting this message because the following recipients had missing or invalid certificates, or conflicting or unsupported encryption capabilities.

 

Secure two-way communication is achieved by both ends having certificates and having both parties give everyone their public key. If this is done then anyone, anywhere can send an encrypted (secret) message to either of these two people. These two people have that same ability and can now send encrypted messages to each other using each other's public key.

 

This will also work with digital signatures. To ensure someone that receives a digitally signed message can read it, your public key is sent along with your message. And, to ensure that the public key that came with the message is really related to the true sender and not just made up, Comodo includes their own signature in your certificate to back up your claim.

 

In order to send an encrypted email to someone Outlook requires that a valid Certificate be associated with the contact who is the intended recipient of the encrypted message. A signed email is the best method of distributing this certificate to those that wish to send you encrypted messages. In order to exchange encrypted messages, both sender and receiver must have a signing and encryption certificate.

To ensure that a certificate has been associated with a contact in Outlook, follow these steps:

 

In Outlook, open contacts by clicking on People, or the people icon in the bottom left hand corner of Outlook.

In the Current View section of the Ribbon, locate and click on the List option. This will change the view to a list of contacts. You will not be able to see certificates for a contact if you are not in List view.

Locate the contact for the person you want to send encrypted emails to and double click on it to open it.

In the Show section of the Ribbon click on Certificates to view the certificates associated with that contact.

If there are no certificates displayed, have the person associated with that contact send a signed email, then check again. If a certificate still does not show up, create a contact from their signed email by following the steps below.

Request a signed email from the person whom you want to send encrypted emails to.

Double click on their name on the signed email you received.

 

In the pop up window, click Add in the right hand side of the window

 

Change or alter any information you like and click Save.

 

Follow the steps above to ensure that there is a certificate associated with that contact.

 

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