SMTP Failed 250

Hi all,

H was able to receive and sending email when my site is only 1, yet when the new sites (with email) being added, my first email cannot be sent again.

Here was my postconf -n result;
[root@NATA-KVM-SSD-IIX3 ~]# postconf -n
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
data_directory = /var/lib/postfix
debug_peer_level = 2
debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5
html_directory = no
inet_interfaces = localhost
inet_protocols = all
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases.postfix
readme_directory = /usr/share/doc/postfix-2.10.1/README_FILES
sample_directory = /usr/share/doc/postfix-2.10.1/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_use_tls = yes
smtpd_recipient_restrictions = permit_sasl_authenticated
smtpd_relay_restrictions = permit_sasl_authenticated defer_unauth_destination
unknown_local_recipient_reject_code = 550

My postfix vesion 2.10.1