Your company has an Exchange Server 2010 organization.
The network contains an internal root certification authority (CA).
You plan to add a disclaimer to all email messages sent by users in the company.
You need to ensure that the disclaimer can be added to encrypted email messages.
What should you do?
A.
Instruct users to encrypt email messages by using IRM only.
B.
Instruct users to encrypt email messages by using S/’MIME only.
C.
Enable the Content Filter agent on all of the Hub Transport servers.
D.
Modify the priority of the Transport Rule agent on all of the Hub Transport servers.
I believe S/MIME cannot be edited by the mailbox server during transit (therefore the rule cannot be applied as it changes the message)
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Using transport decryption for encrypted content
In Exchange 2013, IRM features address these challenges. If messages are IRM-protected, transport decryption allows you to decrypt them in transit. IRM-protected messages are decrypted by the Decryption agent, a compliance-focused transport agent.
The Decryption agent decrypts the following types of IRM-protected messages:
Messages IRM-protected by the user in Outlook Web App.
Messages IRM-protected by the user in Outlook 2010.
Messages IRM-protected automatically by Outlook protection rules in Exchange 2013 and Outlook 2010.
https://technet.microsoft.com/en-us/library/dd638122(v=exchg.150).aspx