I have written an application using java mail api. When i try to send email i get SendFailedException Invalid Addresses; nested exception is: class com.sun.mail.smtp.SMTPAddressFailedException: 550 5.7.1 Unable to relay for firstname.lastname@example.org .
I understand that the server is not allowing relaying. I need to understand one thing. My system is in the same network as the smtp server.My administrator says that all messages from this address range is allowed to send mails.but i still get this problem. my application is running on tomcat5 web server and my company uses exchange server for providing smtp services. please give me solution.