Add blog post about S2S TLS requirement

_posts/2016-12-30-tls-s2s-now-required.md

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+---
+title: TLS is now required for S2S connections
+layout: post
+---
+
+Coming to the end of 2016 I've been really happy with how much traffic this service is receiving. As I don't log anything, I haven't really 
+got a way to see exactly how much you guys have been chatting through xmpp.dk. But I can see from the traffic stats that the server is at least
+generating a fair amount of traffic so that's awesome!  
+  
+Since we are at the end of 2016 and there is an ever-growing push for more and more privcay, I have decided that now is the time to take the next step.
+Up until now, the server has been configured to _prefer_ but not _require_ TLS when connecting to other XMPP servers. That means that even though OTR is 
+required and your messages aren't being transmitted in cleartext, the XMPP messages themselves might have been.  
+But from today, the server's configuration has been changed so that TLS is now a _full requirement_ when another XMPP server wants to connect to us.  
+  
+This decision does come with some problems, however. There are _lots_ of XMPP servers out there that do not support TLS. Unfortunately, this means that you 
+as a user will no longer be able to talk to people who use these servers.  
+  
+If you're having trouble reaching some of your contacts now, you should either get your friends to persuade their providers to start using TLS for everyone's 
+increased privacy, or talk your friends into switching to a provider that already does. There are lots of free Jabber servers out there that do support 
+encrypted communications, so take a look at [xmpp.net][xmppnet] and look for servers that have at least an "A" grade in both C2S (client-to-server) and S2S (server-to-server).  
+  
+Happy new year everyone!  
+  
+/Graffen
+
+
+[xmppnet]: https://xmpp.net/directory.php