One of my friends coded a custom plug-in for the server we used to own that prevents the use of hacked clients almost all together. The plug-in is currently closed source so we would need to speak to the owner about the possibility of it being used. We are planning to open up our own survival server in the near future, we will be using the plug-in on there as well, but in the mean time we are looking to expand our plug-in to other servers of the similar type. We have currently made some updates to the plug-in and e would like to arrange a possible testing of the plug-in in order to make sure that it is compatible with the other plug-ins you have running on the server currently. We are also looking for feedback and beta testers to test before its re-release.
We can talk more about the details of the plug-in if you are interested. We are trying to boost our connections with survival servers so that we could create a possible partnership in the future. Thank you for you time and I look forward to hearing back from you.