As you stated, the group policy objects for Outlook allows you to control the creation but not the viewing. If...
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you are intent on not allow any S/MIME certificates, which are used for encrypting and digitally signing e-mail, you can actually configure your information stores in Exchange so they will not be able store S/MIME; this will also prevent the delivery of signed and encrypted items.
- Using the Exchange System Manager, navigate to the mailbox store that has your user mail on it.
- Now go to the properties page for the mailbox store.
- On the General tab, de-select the checkbox "Clients support S/MIME signatures."
This option was designed to allow compatibility for legacy clients but will have the affect that you are after. On the downside a non-delivery report will be returned to the originator of the encrypted or digitally signed message.
In my humble opinion, though, this is not to be done for security reasons. If you are doing this because your antivirus software doesn't support scanning encrypted e-mail, you should look for one that does, or simply look for one that uses the latest VSAPI (2.5 with Exchange 2003) where S/MIME scanning is supported natively.
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