SMTP Problem

Hi, i have few days trying to connect via Thunderbird but i cant make it work. Thunderbird tells me “incorrect password” but i have checked the password and its right. In var/maillog i have this:
Mar 28 10:18:26 server1 postfix/smtpd[11624]: warning: 189.143.28.175: hostname dsl-189-143-28-175-dyn.prod-infinitum.com.mx verification failed: Name or service not known
Mar 28 10:18:26 server1 postfix/smtpd[11624]: connect from unknown[189.143.28.175]
Mar 28 10:18:26 server1 postfix/smtpd[11624]: setting up TLS connection from unknown[189.143.28.175]
Mar 28 10:18:27 server1 postfix/smtpd[11624]: TLS connection established from unknown[189.143.28.175]: TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)
Mar 28 10:18:29 server1 postfix/smtpd[11624]: warning: SASL authentication failure: Password verification failed
Mar 28 10:18:29 server1 postfix/smtpd[11624]: warning: unknown[189.143.28.175]: SASL PLAIN authentication failed: authentication failure
Mar 28 10:18:31 server1 postfix/smtpd[11624]: warning: unknown[189.143.28.175]: SASL LOGIN authentication failed: authentication failure

In var/log/secure i have:
Mar 28 10:18:27 server1 saslauthd[1847]: pam_unix(smtp:auth): check pass; user unknown
Mar 28 10:18:27 server1 saslauthd[1847]: pam_unix(smtp:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=
Mar 28 10:18:29 server1 saslauthd[1848]: pam_unix(smtp:auth): check pass; user unknown
Mar 28 10:18:29 server1 saslauthd[1848]: pam_unix(smtp:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=

Can you help me please? Thanks.

I have seen that this is a common problem, i have solved adding FLAG -r to /etc/sysconfig/saslauthd
once added it works perfectly. Thanks