Ubuntu

1. Install Postfix and SASL 
   apt-get install postfix sasl2-bin
2. edit /etc/default/saslauthd, change the following:
   START=yes
    
3. Start saslauthd:
   /etc/init.d/saslauthd start
4. test if saslauthd is working:
   testsaslauthd -u username -p password
5. Stop saslauthd:
   /etc/init.d/saslauthd stop
6. Create file /etc/postfix/sasl/smtpd.conf:
   pwcheck_method: saslauthd
    
7. edit /etc/postfix/main.cf :
   

Finally upgraded to 9.04 Jaunty, here's some times might help:

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