User in a different domain is unable to send encrypted Exchange email

Tags:
Email encryption
Exchange Server
I can send encrypted Exchange Server email to a user who is in a different domain, but this user is unable to send me an encrypted email. Why?

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It is possible that their outlook has not been properly configured to send encrypted e-mail, they do not have a user certificate configured and/or created, or that they do not trust or have a trusted CA in the domain where they are located.

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  • Buddyfarr
    are the two domains in the same forest? (windows active directory forest), or are they two separate companies?
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  • Ifconfig
    Yes, in order to send encrypted email, the remote user's certificate needs to be installed or available so that you can encrypt the message using that certificate. It sounds like you have their certificate, they don't have yours. Give us a little more information about your set up (as has been asked) and we'll be able to help you better.
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