Improved email hiding method

src/main/java/fr/xephi/authme/command/executable/email/ShowEmailCommand.java

@@ -34,10 +34,11 @@ public void runCommand(Player player, List<String> arguments) {
 
     private String emailMask(String email){
         String[] frag = email.split("@");   //Split id and domain
-        int sid = frag[0].length() / 3 + 1;     //Define the id view
-        int sdomain = frag[1].length() / 3 + 1;   //Define the domain view
+        int sid = frag[0].length() / 3 + 1;     //Define the id view (must be a value >= 1)
+        String[] dom = frag[1].split(".");  //Domain substrings
+        int sdomain = dom[0].length() / 3;   //Define the domain view (must be a value >= 0)
         String id = frag[0].substring(0, sid) + "*****";  //Build the id
-        String domain = "***" + frag[1].substring(sdomain);  //Build the domain
+        String domain = "***" + dom[0].substring(sdomain) + "." + dom[1];  //Build the domain
         return id + "@" + domain;
     }
 }