Does WebSphere pool the connections from Mail session?

Question

Hi,
I configured a mail session in WebSphere through the console under 'Mail Providers' and did a lookup of the jndi name as below:
try{
javax.naming.InitialContext ctx = new javax.naming.InitialContext();
javax.mail.Session mailSession = (javax.mail.Session) ctx.lookup("mail/TestSession");
MimeMessage mm = new MimeMessage(mailSession);
Transport.send(mm);
catch (MessagingException me) {
}It looks like if I invoke this piece of code 10 times, then 10 connections to the mail server is established to send the message. Doesn't WAS handle the connection pooling under the returned MailSession object?
Thanks

Answer 1

Ok..this is very confusing...we created a singleton class to hold the mail session and the connected transport like this:
public class MailCache
     private static MailCache sessionPool = new MailCache();
     private static Session mailSession ;
     private static Transport transport;
     static {
          try
               mailSession = (Session) LookupHelper.lookup("mail/TestSession");
               transport = mailSession.getTransport();
               transport.connect();
     public static Transport getTransport() {
          if (transport == null) {
               try
                    transport = getMailSession().getTransport();
                    transport.connect();
               catch (NoSuchProviderException e)
                    e.printStackTrace();
               catch (MessagingException e1)
                    e1.printStackTrace();
          else {
               // transport exists, check if connected!
               if (!transport.isConnected()) {
                    try
                         transport.connect();
                    catch (MessagingException e)
                         e.printStackTrace();
          return transport;
     public static Session getMailSession() {
          if (mailSession == null) {
               System.out.println("Mail session scoped out");
          return mailSession;
}and this is how I send the mail:
MimeMessage message = new MimeMessage(MailCache.getInstance().getMailSession());
Transport transport = MailCache.getInstance().getTransport();
transport.send(message);
...When I send a bulk mail (for e.g. 20 messages) in a loop (setup as a junit) I notice that 21 connections are established on the smtp server trace for sending the messages. All the connections process exactly 1 message and get disconnected after sending the message. But one connection (i presume its the one that Ia, holding open in the singleton) is never used at all!. What Iam trying to acheive is to have only 1 connection open from my server to send messages. What am I doing wrong?