Two methods to delete an item permanently:
1) Use the Delete method on the item, then find the same item in the Deleted Items folder, maybe using the Find method to match the subject, and delete it, too.
2) Use CDO's Delete method on the item, which will delete it permanently in one step. Sample code at
http://www.outlookcode.com/codedetail.aspx?id=41
Note that CDO is not part of the default Outlook installation. You may need to rerun setup and add it.
--
Sue Mosher, Outlook MVP
Outlook and Exchange solutions at
http://www.slipstick.com
Author of
Microsoft Outlook Programming: Jumpstart
for Administrators, Power Users, and Developers