I found this, hopefully this helps:
By default, Confluence will send an email notification to all Confluence administrators whenever someone signs up to the Confluence site. The administrators (people with Confluence Administrator or System Administrator permissions) will receive this message when someone signs up either by clicking the 'Sign Up' link or by clicking the invitation URL sent by an administrator.
To disable this notification:
Thanks. But I'm looking for the notice not to go to the user. The email to the administrators is fine. We know what to ignore. But when your system is setup for AD authentication (SSO) and the tool tells your users to reset their password... Causes a lot of confused users.
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