In that case, your only option is to manually add the headers wherever you want them to appear. Adding them anywhere other than the very start & end of the email is likely to be a waste of time, though, as you have no control over where they'd appear if the recipient prints the email. IMHO, any organisation that won't accept docx or PDF attachments is unlikely to be around for very long.

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Cheers,
Paul Edstein
[Fmr MS MVP - Word]