Not out of the box, but I don't see why you couldn't write a little code
to do it, should be easy enough, just to have Outlook check for a certain
string within an email message when sending and, if present, replace it with
the data you want to replace it with, but, one has to ask, why? I've yet
to see a mail client that doesn't display the subject and the To field, why
do you need them added to the body of the message as well?
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-f.h.
Can you please recommend where I could find information on this "code" that
you refer to?
Personally, I'd find a different service, but, you'd do something like http://www.outlookcode.com/codedetail.aspx?id=1278
and change the code around.
I mean, you could build a quickpart that includes the 'to be replaced' text
and then, with the code, replace the 'to be replaced' text if you're sending
to the domain of the fax service.
If you're not comfortable writing code, you'll probably want to hit either
microsoft.public.outlook.program_vba or http://www.outlookcode.com for some
more explicit handholding.
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-f.h.