SMTP problems

[Subhro]

Hello folks,

I am trying to set up a mailserver with virtual mailboxes and SASL 
authentication for SMTP. I am following the instructions at:

http://high5.net/howto/

However when I try to connect to the SMTP, my log file shows:

subhro at munich:/var/log# cat maillog
Apr 13 13:04:40 munich postfix/smtpd[27064]: connect from 
unknown[59.93.160.227]
Apr 13 13:04:51 munich postfix/smtpd[27064]: warning: SASL 
authentication failure: cannot connect to Courier authdaemond: No such 
file or directory
Apr 13 13:04:51 munich postfix/smtpd[27064]: warning: SASL 
authentication failure: Password verification failed
Apr 13 13:04:51 munich postfix/smtpd[27064]: warning: 
unknown[59.93.160.227]: SASL PLAIN authentication failed
Apr 13 13:04:52 munich postfix/smtpd[27064]: warning: SASL 
authentication failure: cannot connect to Courier authdaemond: No such 
file or directory
Apr 13 13:04:52 munich postfix/smtpd[27064]: warning: 
unknown[59.93.160.227]: SASL LOGIN authentication failed
Apr 13 13:04:55 munich postfix/smtpd[27064]: lost connection after AUTH 
from unknown[59.93.160.227]
Apr 13 13:04:55 munich postfix/smtpd[27064]: disconnect from 
unknown[59.93.160.227]

Anyone would kindly point me to where I am going wrong?

Regards
S.