Added a static method to normalize an email address.

git-svn-id: https://samskivert.googlecode.com/svn/trunk@1835 6335cc39-0255-0410-8fd6-9bcaacd3b74c

src/java/com/samskivert/net/MailUtil.java

@@ -52,6 +52,19 @@ public class MailUtil
         return _emailre.matcher(address).matches();
     }
 
+    /**
+     * @return a normalized form of the specified email address
+     * (everything after the @ sign is lowercased).
+     */
+    public static String normalizeAddress (String address)
+    {
+        // this algorithm is tolerant of bogus input: if address has no
+        // @ symbol it will cope.
+        int afterAt = address.indexOf('@') + 1;
+        return address.substring(0, afterAt) +
+            address.substring(afterAt).toLowerCase();
+    }
+
     /**
      * Delivers the supplied mail message using the machine's local mail
      * SMTP server which must be listening on port 25.