In general, that doesn't work, not in the least because you don't know what mail client the recipient has. The exception is when both sender and recipients are working in the same Exchange organization and you can publish to the Organizational Forms library on the Exchange server. In that scenario, you can do data-gathering with a custom Outlook form.
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Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers