Plugin installed incorrectly. Rename plugin directory 'swiftmail.backup' to 'swiftmail'.
This is an old revision of the document!
Emptying the cache in Internet Explorer 7
1. Within the Extras menu, click on Internet Options.
2. Within the General tab, go to the Browsing History section and select Delete.
3. In the Temporary Internet Files click on Delete Files.
4. Confirm by clicking Yes.