There is a known bug connected with the incorrect "From" value in the notification when moving page in Confluence.
https://jira.atlassian.com/browse/CONF-21969
The bug is fixed only in 4.0 and no workarounds suggested for earlier versions of Confluence.
Can you share your experience in fighting this problem in your Confluence < 4.0?
I thouht of changing a email template, but not sure it will help.
Thanks.
Anna.