Problem in Java Mail

Dear Experts,

In my java mail coding i had given like this

Properties props = System.getProperties();            
props.put("mail.smtp.host","64.57.252.112"); where 64.57.252.112 is one of the mail server address,as you know.

But it is throwing an error like
16:00:20,991 INFO  [STDOUT] javax.mail.SendFailedException: Sending failed;
  nested exception is:
      class javax.mail.SendFailedException: Invalid Addresses;
  nested exception is:
      class javax.mail.SendFailedException: 550 5.7.1 <manikandan.madhu@gmail.com>... Relaying denied. IP name possibly forged [203.200.51.5]

Please advice.Start Free Trial