To add an X-header, you need to create a named string MAPI property with a
particular GUID.
See http://www.dimastr.com/redemption/faq.htm#14 for a Redemption example.
It shows how to change the "From" header, but it is equally applicable to
any MME header.

Dmitry Streblechenko (MVP)
http://www.dimastr.com/
OutlookSpy - Outlook, CDO
and MAPI Developer Tool

"BrushLee" wrote in message
...
I need to add custom field to SMTP header of Outlook 03/07 email item
Something like Spam/Antivirus software does.
I cannot find how to address the header.