Problem: The password that I used to authenticate for the SMTP server was rejected:
Apr 5 20:04:55 lion postfix/smtpd[7607]: connect from client.com[ww.xx.yy.zz] Apr 5 20:04:55 lion postfix/smtpd[7607]: warning: SASL authentication failure: cannot connect to saslauthd server: Permission denied Apr 5 20:04:55 lion postfix/smtpd[7607]: warning: SASL authentication failure: Password verification failed Apr 5 20:04:55 lion postfix/smtpd[7607]: warning: client.com[ww.xx.yy.zz]: SASL PLAIN authentication failed: generic failure Apr 5 20:04:55 lion postfix/smtpd[7607]: lost connection after AUTH from client.com[ww.xx.yy.zz] Apr 5 20:04:55 lion postfix/smtpd[7607]: disconnect from client.com[ww.xx.yy.zz]
And after 2 minutes I found the solution via Google:
adduser postfix sasl /etc/init.d/postfix restart
My setup is: Postfix with SASL (chrooted) on Debian squeeze.