We are thinking about implementing email/message encryption using S/MIME and I wanted to know how it all works with shared mailboxes. I'm not sure how it all works, but I wanted to know more about how it works with shared mailboxes.
From what I understand, for regular users, every user has a certificate assigned to him and when sending emails to other users with their own certificate, they can open the encrypted emails. But, when creating a shared mailbox, Exchange actually creates a disabled user in AD and the mailbox is classified as SharedMailbox, not UserMailbox.
So I have a few questions...
Can a certificate be assigned to a shared mailbox / a shared mailbox disabled user?
Can users with permissions to the shared mailbox be able to open encrypted emails sent to the shared mailbox by other users or by one of the users who have permissions to the shared mailbox?
Hope you can help me figure it out. Any documentation will be also helpful.