I am having the coding for sending mail thru jmail and cdonts. But if the mail is invalid for example(firstname.lastname@example.org) then the cdonts and jmail returns true or value that i have send the mail. But it is false. Then my gateway search for the particular domain and it was locked in gateway due to invalid ID. so these was the problem ?. Please do the needful for me?. I want to get wheteher it was sent to the Mail id or not. I want to get a reply mail sent or Failure for the Mail ID.