não consigo conectar via smtp

May 2 23:55:11 servidor postfix/smtpd[17830]: connect from unknown[192.168.0.21]
May 2 23:55:11 servidor postfix/smtpd[17830]: warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: Invalid argument
May 2 23:55:11 servidor postfix/smtpd[17830]: warning: SASL authentication failure: no secret in database
May 2 23:55:11 servidor postfix/smtpd[17830]: warning: unknown[192.168.0.21]: SASL NTLM authentication failed
May 2 23:55:11 servidor postfix/smtpd[17830]: warning: SASL authentication problem: unable to open Berkeley db /etc/sasldb2: Invalid argument
May 2 23:55:11 servidor postfix/smtpd[17830]: warning: SASL authentication failure: no secret in database
May 2 23:55:11 servidor postfix/smtpd[17830]: warning: unknown[192.168.0.21]: SASL NTLM authentication failed

este é o erro que ocorre qdo tento autenticar via smtp,

ae galera me ajuda ae por favor

http://www.postfix.org/SASL_README.html