Seems to be really old school method for the proxy users to find fresh proxy website or for the proxy webmasters to advertise their new proxy website but the truth is that proxy groups still works and works great!
It's probably one of the easiest ways for proxy users to get daily updated fresh proxy site right into their email boxes without having to search one the internet for them. As for the that proxy owners it's a fast, easy and above all economic way to promote their brand new proxy website to targeted opt-in audience.
There are numerous proxy groups to which you could subscribe to. But you would have to search to find them and make sure they are active and not abandoned or spammed with irrelevant posts. An excellent website that provides you with active proxy groups to subscribe to and get new proxy site into your email boxes is Proxy Email List. If you on the other hand you are a proxy owners and are looking to promote your proxy website then you can use ProxyNoid proxy promotional service and boost your proxy to over than 50.000 opt-in proxy group subscribers.