Bulk invite

Hi,

I have a WordPress site which I host on ipeer. The site should only be accessible by my friends and family. What I would like to do is to send a bulk invitation to my friends (maybe just specifying their email adresses). In the invitation they should get a link to a signup (or subscription) page on my site (maybe using a token so the signup/subscription page is unaccessible for others).

Anyone who knows if such a plugin exists for WordPress? I have been looking around but haven’t found anything yet, wp-inites (for example) only provides the tokens but nothing more, Members Only doesn’t provide bulk invitations.

Please help.