You can set these properties using Extended MAPI (shouldn't be a problem if
you are using C++) - IMessage interface can be obtained through the
MailItem.MAPIOBJECT property. To retrieve the accoutn naame and id, use the
IOlkAccountManager interface.

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Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool
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"ryotyankou via OfficeKB.com" u48591@uwe wrote in message
news:8fd0a5122dad4@uwe...
Thank you Dmitry, but how about outlook2003, the main task of our product
should be implemented on 2003 not 2007.(I known outlook2007 have some new
interfaces and structruces can do the job easily).

Dmitry Streblechenko wrote:
UseMailItem.SendUsingAccount property (Outlook 2007 specific).

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