Enable Exchange DLP, eDiscovery, Journaling and other functions to decrypt protected attachments
Add new options in EXO DLP to interrogate and analyze protected attachments in unprotected emails or in emails protected with a different policy.
Support for attachments in protected emails (with the same or different policy) is already available, support for protected attachments in unprotected emails is being completed (currently in testing).
James Cradock commented
Currently JRDA and eDiscovery are only able to decrypt an email (and an attachment if protected with the email). The tools are unable to iterate through the protection to remove ALL protection. If you have protected a document before attaching it to the email, this will not be decrypted.