[Postfix-es] problema de auth con relay

[Maxnux]

Hola a ver si alguien me puede ayudar con esto
 Estoy configurando un postfix para que haga relay atraves de un isp ( 
fibertel para los que sean de argentina) este requiere autentificacion
usando de http://www.postfix.org/SASL_README.html#client_sasl
Puse esto

    /etc/postfix/main.cf <http://www.postfix.org/postconf.5.html>:
        smtp_sasl_auth_enable <http://www.postfix.org/postconf.5.html#smtp_sasl_auth_enable> = yes
        smtp_sasl_password_maps <http://www.postfix.org/postconf.5.html#smtp_sasl_password_maps> = hash:/etc/postfix/sasl_passwd
        smtp_sasl_type <http://www.postfix.org/postconf.5.html#smtp_sasl_type> = cyrus
    smtp_sasl_security_options <http://www.postfix.org/postconf.5.html#smtp_sasl_security_options> = noanonymous


    /etc/postfix/sasl_passwd:
           
        [smtp.fibertel.com.ar] username:password
      

y sale este error

May  7 22:22:48 mail postfix/qmgr[11953]: B1C4C29C7: from=<root en mail>, 
size=427, nrcpt=1 (queue active)
May  7 22:22:49 mail postfix/smtp[12291]: warning: SASL authentication 
failure: No worthy mechs found
May  7 22:22:49 mail postfix/smtp[12292]: warning: SASL authentication 
failure: No worthy mechs found
May  7 22:22:49 mail postfix/smtp[12292]: B1C4C29C7: 
to=<test en dominio.com>, relay=smtp.fibertel.com.ar[24.232.0.227], 
delay=11804, status=deferred (Authentication failed: cannot SASL 
authenticate to server smtp.fibertel.com.ar[24.232.0.227]: no mechanism 
available)
May  7 22:22:49 mail postfix/smtp[12291]: 91D762A01: 
to=<test en dominio.com>, relay=smtp.fibertel.com.ar[24.232.0.227], 
delay=11444, status=deferred (Authentication failed: cannot SASL 
authenticate to server smtp.fibertel.com.ar[24.232.0.227]: no mechanism 
available)

 El smtp de fibertel responde con esto
 
maxnux en maxnux-n:~$ telnet smtp.fibertel.com.ar 25
Trying 24.232.0.227...
Connected to smtp.fibertel.com.ar.
Escape character is '^]'.
220 avas-mr14.fibertel.com.ar ESMTP (NO UCE,UBE,SPAM) Alerce-MR listo 
Mon, 7 May 2007 22:41:16 -0300
EHLO dns.liocba.com.ar
250-avas-mr14.fibertel.com.ar expected "EHLO cpe-6-239.bvconline.com.ar"
250-SIZE 10485760
250-8BITMIME
250-PIPELINING
250-CHUNKING
250-ENHANCEDSTATUSCODES
250-DSN
250-AUTH=LOGIN
250-AUTH LOGIN
250 HELP
 
alguna idea por que da ese error ???      


root en mail:/home/admin_remoto# postconf -n
alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
body_checks = regexp:/etc/postfix/body_checks
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/lib/postfix
debug_peer_level = 2
disable_vrfy_command = yes
header_checks = regexp:/etc/postfix/header_checks
home_mailbox = Maildir/
html_directory = /usr/doc/postfix-2.2.10/html
inet_interfaces = all
local_recipient_maps = unix:passwd.byname $alias_maps
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/man
message_size_limit = 5120000
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
myhostname = mail.local.com.ar
mynetworks = 192.168.0.0/24, 127.0.0.0/8
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/doc/postfix-2.2.10/readme
relayhost = [smtp.fibertel.com.ar]
sample_directory = /usr/doc/postfix-2.2.10/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd
smtpd_data_restrictions = reject_unauth_pipelining,    permit
smtpd_helo_required = yes
smtpd_helo_restrictions = permit_mynetworks,     reject_invalid_hostname
smtpd_recipient_restrictions = reject_non_fqdn_sender,    
reject_non_fqdn_recipient,    reject_unknown_sender_domain,    
reject_unknown_recipient_domain,    reject_unauth_pipelining,    
permit_mynetworks,    reject_invalid_hostname,    
reject_non_fqdn_hostname,    reject_unauth_destination,    
reject_rbl_client relays.mail-abuse.org,    reject_rbl_client 
list.dsbl.org,    reject_rbl_client sbl.spamhaus.org,    
reject_rbl_client cbl.abuseat.org,    reject_rbl_client 
dul.dnsbl.sorbs.net,    reject_rbl_client web.dnsbl.sorbs.net,    
reject_rbl_client dialups.mail-abuse.net,    permit
unknown_local_recipient_reject_code = 550