Alpine
How to use alpine? Install Alpine in clinet system and send the mail using alpine.. To install the alpine run this command in the terminal. apt-get install alpine After that if you dont have configure MX records In dns then first create it The ip that you are seeing is the ip of server POSTFIX . mail IN A ip IN MX 10 mail Now configure the Alpine. Hit the S to enter into the setup Enter C Here you have to wirte the User domain (you'r domain) SMTP server (your SMTP as you have write in the DNS server) After that Enter E to save this configuration and then compose the mail to you'r user.. THATS IT.....