"This is a daily summary of all changes in Confluence of all spaces visible to you.
If you do not want to receive this email any more you can change your profile options here."

the last word "here" is linked to the url:
http://confluence.atlassian.com/$baseurl/users/editmyprofile.action

$baseurl I assume should have been resolved to some other value along the way. Actually, as long as I'm already logged in, removing "$baseurl" altogether fixes the problem.