From time to time when you first connect to a server with IMAP settings you may find when you delete a email out of Microsoft Outlook 2003/2007/2010 there will be a line through the email instead of actually being deleted.
The instructions below will help you set Microsoft Outlook to automatically delete your emails :-
Automatically purge the deleted items
You can configure Microsoft Outlook so that when you switch between folders, any items you have marked for deletion are purged from the IMAP mail server.
- Click a folder in your IMAP e-mail account.
- On the Edit menu, point to Purge Deleted Messages.
- Click Purge Options.
The Internet E-mail Settings dialog box opens.
- On the General tab, under Purge Options, select the Purge items when switching folders while online check box.