Add NullTransport for testing and TCK
diff --git a/geronimo-mail_2.1/geronimo-mail_2.1_provider/src/main/java/org/apache/geronimo/mail/transport/NullTransport.java b/geronimo-mail_2.1/geronimo-mail_2.1_provider/src/main/java/org/apache/geronimo/mail/transport/NullTransport.java
new file mode 100644
index 0000000..a35ce14
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+++ b/geronimo-mail_2.1/geronimo-mail_2.1_provider/src/main/java/org/apache/geronimo/mail/transport/NullTransport.java
@@ -0,0 +1,40 @@
+/**
+ *  Licensed to the Apache Software Foundation (ASF) under one or more
+ *  contributor license agreements.  See the NOTICE file distributed with
+ *  this work for additional information regarding copyright ownership.
+ *  The ASF licenses this file to You under the Apache License, Version 2.0
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.apache.geronimo.mail.transport;
+
+
+import jakarta.mail.Address;
+import jakarta.mail.Message;
+import jakarta.mail.MessagingException;
+import jakarta.mail.Session;
+import jakarta.mail.Transport;
+import jakarta.mail.URLName;
+
+public class NullTransport extends Transport {
+    public NullTransport(Session session, URLName urlName) {
+        super(session, urlName);
+    }
+
+    public void sendMessage(Message message, Address[] addresses) throws MessagingException {
+        // do nothing
+    }
+
+    protected boolean protocolConnect(String host, int port, String user, String password) throws MessagingException {
+        return true; // always connect
+    }
+
+}