how to filter out encrypted messages ?

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Jul 7, 2011
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The way we are doing is we are finding out the message class of a mail message and if it contains "smime" or "secure" then we filter the mail message out.
For some of the encrypted messages the PR_MESSAGE_CLASS returned is "IPM.Note" only. In such cases how to find out the actual message class?

Is there any other better way of filtering out encrypted mail messages?
 
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