IronPort email encryption config precedence

Hi,
I'm reading thru the IronPort Email Config Guide for Email encryption. I have noticed up to three different ways of requesting certain encryption parameters. I'd like to make sure I understand the order of precedence for these different methods, when multiple options are encountered for a given message.
For example, to configure Read Receipts on an outbound secure message:
a) I can configure Read Receipt in the Encryption Profile
b) I can configure a Content Filter to add an encryption header "X-PostX-Send-Return-Receipt" to the message
c) At the time of sending the message, from BCE app, I can select Read Receipt (or for certain attribuutes, I can use the CRES admin console and ask for the actions such as message expiration, etc)
So given the above methods for requesting a certain action, my understanding is that the order of precedence is:
c -> b -> a
That is, (c) overrides (b); and (b) overrides (a).
Is the above correct?
And as for (c), is it also correct to expect that the upcoming Outlook plugin release 7.3 will enable a desktop user to set the same flags on an outbound message as supported today in BCE app (such as requesting ReadReceipt, etc.)?
Thaks for any help.

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"http://www.w3.org/TR/html4/loose.dtd">
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<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
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<br>
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<strong>Help -</strong> <a href="https://res.cisco.com/websafe/help?topic=RegEnvelope">https://res.cisco.com/websafe/help?topic=RegEnvelope</a><br>
<strong>About Cisco Registered Email Service -</strong> <a href="https://res.cisco.com/websafe/about">https://res.cisco.com/websafe/about</a>
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</tr>
<tr>
<td> </td>
</tr>
</table>
</td>
</tr>
</table>
</body>
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IronPort email encryption config precedence

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