Transport Rule rejection message

I am creating a transport rule that says when a recipients properties contain specific words,
Send rejection message to sender with enhanced status code.
My problem is that I don't know how to change the color or size of the text that I specify in the rejection message. I tried to use html but it does not work properly. It just shows my html commands when rejected by OUtlook.
thanks very urgent!
kcassoneAsked:
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Simon Butler (Sembee)ConsultantCommented:
You cannot change the format of the NDR message.
NDRs are plain text, which the MTA will format itself. It isn't something that you can change.

Simon.
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