Don't even think about using a published custom form (which is what this would require) for outgoing messages to customers and prospects. It will cause frustration (or worse) for any non-Outlook recipients.
You might want to consider moving to Outlook 2007, which makes it very easy to flag outgoing messages for followup -- and have that followup be private to the sender, not going out in the mail message.
--
Sue Mosher, Outlook MVP
Author of Configuring Microsoft Outlook 2003
http://www.turtleflock.com/olconfig/index.htm
and Microsoft Outlook Programming - Jumpstart for
Administrators, Power Users, and Developers
http://www.outlookcode.com/jumpstart.aspx
"Frankyyz" wrote in message news

I would like to create an email form that includes the "due by" functionality
found in the existing flagging system.
Useful sales tool as the sent email would be filed in the 'for follow up'
directory with date already set.
Thanks in advance
frank