Ironport - email becomes garbled

Hello,
we are using Ironport (virtual appliance) and one email gets changed by the email gateway. The problematic message is a HTML email that is sent from a qmail MTA system. When the email flows through the Ironport gateway the HTML content isn't displayed correctly - raw HTML code is displayed.
I've tried to disable all the email Policies that could potenally influence the email but the problem persists. Additionally I've checked the source of the email and the only difference between the two emails is in the header - the email that goes through Ironport has one additional hop under "Received" part.
Do you have any suggestions what should be additionally checked on the Ironport virtual appliance ?
BR,
Jan

Hi,
I've created a TEST Mail Flow Policy that has all the security features disabled (Spam Detection, Virus Protection etc.). I checked with message tracking and the MFP is successfully used when the problematic email hits the appliance. Other stuff under message tracking also seem to be ok.
I've tried to send the email to gmail and also to the same MTA but this time bypassing Ironport, both times the email was displayed correctly.

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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:
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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:
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Ironport - email becomes garbled

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