I followed that how to with an exception :
http://forums.fedoraforum.org/forum/...ovecot+postfix
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions =
permit_sasl_authenticated,
check_relay_domains
where i changed the smtpd to smtp ..
and it works like a charm