However it is also seen that email of the desired contact person is not available, in such cases we can use the email format of employer,based on email format,we can guess the email id of person,which is correct more often. Further,we can validate these email addresses using Email verifies or by sending test email to each id and record the delivery status.
I have enclosed a sample from similar project I did recently, Please review it and kindly let me know if you have any queries.