One of my proffessor is in italy for a trip. He called me up and says that he was not to able to send mails to other group, but he could receive the mails. He also gave me the ip address(192.168) to allow access to send mails . I have a little bit of idea that I need to add it in /etc/mail/access file , But I'm not sure if it is going to work. Can anyone tell me in detail how to allow him to send mails.