> > sigh. did you change the order of the restrictions ? Yes. reject_non_fqdn_sender is now the only restriction. And these configurations are at the last lines of main.conf. Is this OK?
[r...@rhel5 postfix]# tail main.cf # readme_directory: The location of the Postfix README files. # readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES smtpd_sender_restrictions = reject_non_fqdn_sender non_fqdn_reject_code = 501 strict_rfc821_envelopes = yes append_dot_mydomain = no append_at_myorigin = no Thanks, Mingliang