how to set up postfix
=====================

1. install postfix (if not installed yet)

   sudo apt-get install postfix


2. basic configuration

   sudo dpkg-reconfigure postfix

   settings
   ========

   a) internet site
   b) mail name: icc-computer.com
   c) Root and postmaster mail recipient: lei
   d) earthlink.net => icc-computer.com
   e) 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128 192.168.1.0/24
   f) all

 
   chang (on sudo nano /etc/postfix/main.cf)
   =========================================

   a) my host name: ubuntu9.earthlink.net => smtp.icc-computer.com
   b) check / confirm the above settings
  

3. SASL (for SMTP Authentication)
 
   Note: SASL allows a client to identify itself via TLS, so as to relay mail, 
   which is done by simply installing the package "dovecot-postfix ". 
        This package will install Dovecot, it is not only used for SASL, but also 
   for IMAP, IMAPS, POP3, and POP3S, as a Mail Delivery Agent (MDA) 

   sudo apt-get install dovecot-postfix   

      
4. change (sudo nano /etc/dovecot/dovecot-postfix.conf)
   Note: /etc/dovecot/dovecot.conf wouldn't work. 

   disable_plaintext_auth = no
 
5. sudo /etc/init.d/postfix restart
   sudo /etc/init.d/dovecot reload


6. test: telnet smtp.icc-computer.com 25 

7. trouble-shooting 

   sudo nano /var/log/mail.log (easier via webmin)