how to send mail thru an ordinary java programme?

I am importing "java.net.*", "java.io.*", "java.util.Date" and some java code to send an E-mail.
My Mail server is working perfect.
But when I execute the my java programme it's giving the exception,
java.lang.StringIndexOutOfBoundsException: String index out of range: 0.

Earlier I used to send mail with the same Programme.
What's wrong?

Here is my sendMail method code.

public void sendMail()
{


try{
String response;
Socket mailSock = new Socket (Mailserver, SMTPPort);


BufferedReader bin= new BufferedReader(new InputStreamReader(mailSock.getInputStream()));


PrintWriter pout= new PrintWriter( new OutputStreamWriter(mailSock.getOutputStream()));


response=bin.readLine();
...........
...........
...........

mailSock.close();
}


catch(IOException ioe)
{}
}


what's wrong?


Thanks, in advance.



Sincerely
Damu