Hi Ken

Thank you for that. I thought I might have to dig out my old C++ books:-)

Cheers
Peter


"Ken Slovak - [MVP - Outlook]" wrote in message
...
You can't use the Outlook object model to add an x-header, you would have
to use a lower level API such as CDO 1.21 (optional installation and not
supported in .NET code), Extended MAPI (C++ or Delphi only and not
supported in .NET code) or a COM wrapper around MAPI like Redemption
(www.dimastr.com/redemption).

A CDO sample to create an x-header is shown in a custom form at
http://www.ivasoft.biz/addheader3.html.

--
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Absolute Beginner's Guide to Microsoft Office Outlook 2003
Reminder Manager, Extended Reminders, Attachment Options
http://www.slovaktech.com/products.htm


"Peter" wrote in message
...
Greetings

I am a newbie so please be gentle:-)

Am using OL2003, VSTO 2005SE with VS2005 (VB.NET)

I have managed to create an addin using VSTO a toolbar with dropdown on a
new mail message that adds a security classification to the subject line
before the mail is sent. What I am also trying to do is add a custom
header (X-Protective-Marking to the mail message before it is sent. I
can't easily see how to do this.

Any help or pointers so other examples would be greatly appreciated.

Cheers
Peter Lock
Palace Software