These Login/Logout Broadcast scripts have been released dozens of times over the years. This one however, will broadcast when a new player logs in for the first time. Some folks may find this useful. 

Special thanks to Tabain for providing the correct EventSink!

All credit for this script goes to the original author, Mordero. Installation is a simple drag n' drop into your Custom Scripts folder.

You can customize the New Player Login message on line 24:
private readonly static string m_NewPlayerMessage = "Welcome the newest member of our shard, {0}!"; //New Player Message

You can also change the red hue to another color of your choice, on line 25.
private readonly static int m_NewPlayerHue = 33; //New Player Message Hue

You can of course, make edits to the basic Login/Logout messages and hues, as well. Enjoy!