I've seen multiple servers where you can connect from any (recent) major version. (Example, 1.9, 1.8 OR 1.7) And they all seem to be able to do it. Alas, a simple google search did not fix the problem. Any ideas? Thanks guys.
(PS: The Minecraft server is running on the latest Spigot for 1.10 as of 6/27/16)