MIME4J-253 fix parsing encoded local part (#65)

diff --git a/dom/src/main/java/org/apache/james/mime4j/field/address/LenientAddressParser.java b/dom/src/main/java/org/apache/james/mime4j/field/address/LenientAddressParser.java
index c059826..153f449 100644
--- a/dom/src/main/java/org/apache/james/mime4j/field/address/LenientAddressParser.java
+++ b/dom/src/main/java/org/apache/james/mime4j/field/address/LenientAddressParser.java
@@ -184,7 +184,7 @@
 
     private Mailbox createMailbox(final String localPart) {
         if (localPart != null && localPart.length() > 0) {
-            return new Mailbox(null, null, localPart, null);
+            return new Mailbox(null, null, DecoderUtil.decodeEncodedWords(localPart, this.monitor), null);
         } else {
             return null;
         }
diff --git a/dom/src/test/java/org/apache/james/mime4j/field/address/LenientAddressBuilderTest.java b/dom/src/test/java/org/apache/james/mime4j/field/address/LenientAddressBuilderTest.java
index 36aee6c..0c622ad 100644
--- a/dom/src/test/java/org/apache/james/mime4j/field/address/LenientAddressBuilderTest.java
+++ b/dom/src/test/java/org/apache/james/mime4j/field/address/LenientAddressBuilderTest.java
@@ -216,6 +216,12 @@
     }
 
     @Test
+    public void testParseMailboxEncodedLocalPart() throws ParseException {
+        Mailbox mailbox1 = parser.parseMailbox("=?utf-8?B?IkvDpXJlIFPDpnRyZSIgPGtzQGRvbWFpbi5jb20+?=");
+        Assert.assertEquals("\"Kåre Sætre\" <ks@domain.com>", mailbox1.getLocalPart());
+    }
+
+    @Test
     public void testParseMailboxNonASCII() throws Exception {
         Mailbox mailbox1 = parser.parseMailbox(
                 "Hans M\374ller <hans.mueller@acme.org>");