hello everyone! I have followed this tutorial: http://www.howtoforge.com/virtual-users-and-domains-postfix-courier-mysql-centos5.1 After finish it, i just add in mysql the domain and a user. no transport/forwards. Then i send from the server console a mail to the account. (using mail cmd) Then i configure thunderbird to use the account, and with no problem it works, and i get my message (so i'm assuming receiving is working ok). But when i try to send a mail i always get password error i've checked /var/log/messages: Code: Mar 6 05:26:37 retail saslauthd[2771]: do_auth : auth failure: [user=trium] [service=smtp] [realm=example.com] [mech=pam] [reason=PAM auth error] I've checked /var/log/mailog: Code: Mar 6 06:02:35 retail postfix/smtpd[3330]: connect from HugoRodrigue-PC.mshome.net[192.168.0.159] Mar 6 06:02:40 retail postfix/smtpd[3330]: warning: SASL authentication failure: Password verification failed Mar 6 06:02:40 retail postfix/smtpd[3330]: warning: HugoRodrigue-PC.mshome.net[192.168.0.159]: SASL PLAIN authentication failed: authentication failure Mar 6 06:02:42 retail postfix/smtpd[3330]: warning: HugoRodrigue-PC.mshome.net[192.168.0.159]: SASL LOGIN authentication failed: authentication failure Mar 6 06:02:44 retail postfix/smtpd[3330]: disconnect from HugoRodrigue-PC.mshome.net[192.168.0.159] I make everything without any apparently error, the only different thing from the tutorial was the output of the telnet command (Page 5 - Instruction 14): Code: [root@retail log]# telnet localhost 25 Trying 127.0.0.1... Connected to localhost.localdomain (127.0.0.1). Escape character is '^]'. 220 retail.example.com ESMTP Postfix ehlo localhost 250-retail.example.com 250-PIPELINING 250-SIZE 10240000 250-VRFY 250-ETRN 250-STARTTLS 250-AUTH LOGIN PLAIN 250-AUTH=LOGIN PLAIN 250-ENHANCEDSTATUSCODES 250-8BITMIME 250 DSN Anyone have this issue? What can i do to get more info about this problem? Thanks!