Single Use Invitations for Invitation ONLY Dolphin Sites

Is there a way to implement single use invitations for invitation only dolphin websites?  Currently, the system allows anyone that knows the invitation code and number to join.

Example-  I sent  out an invitation from User one.  With a forwarded DL link I was able to join 3 different times from 3 different email address and 3 different IP addresses.

For my next project I need more security than that.  I need a use once and discard invitation system.  The system has to recognize when an invitation has been sent and when it has been used.  Members should ONLY be able to join through that ONE invitation.  If that message is forwarded after the invited person joins, the link should send the person to the THIS WEBSITE IS INVITATION ONLY page.

Is there a paid mod that will facilitate this?

Post this in a job section

It seems this is still an issue, anyone that has the web address with the extension - /?idFriend=9 regardless of the number can use that to join the site when it is set to by invite only.

Anyone know what is going on with this?  My site is strictly y invite only from the Admin, I have removed the links on the template so they can not be clicked, obviously if someone has the address the they can use it but we don't advertise it.

There needs to be a better system for invitation only sites.

The mod Ultimate Referrals does this. By issuing a specific invitation url for each invitation, it keeps your site from being accessed by the generic code.