As a SharePoint administrator, you should be fairly familiar with this error message:
If you’re not, it could mean that your SharePoint’s site access requests aren’t going to the correct email address…or you might just be ignoring them! In any case if you find that you need to manage where these site access requests go you can do.
When a SharePoint site collection is provisioned, site access requests are configured to be sent to the email address(s) specified at the point which the site was created, but a site administrator can change this for each site within the site collection they administer. By default, when a sub-site is created the same email address(s) that are configured on the parent site are used for access requests to the sub site.
Follow the steps below to change these settings:
In Site Actions – Site Permissions
Select Manage Access Requests from the ribbon
Specify the email address to send requests to and click OK. Note: you can add multiple email addresses here, just separate each address with a semicolon.
Note: With manage access requests configured users can click a link on the access denied page when they are unable to access content. If no email address has been configured for this site, the link will not appear on the access denied page.