Analizem por favor "main.cf"

command_directory = /usr/sbin
daemon_directory = /usr/lib/postfix
default_privs = nobody
myhostname = meudominio.com.br
mydomain = meudominio.com.br
myorigin = $mydomain
inet_interfaces = all
mydestination = $myhostname, localhost.$mydomain, $mydomain,mail.$mydomain,www.$mydomain,ftp.$mydomain
#mynetworks = 168.100.189.0/28, 127.0.0.0/8
#relay_domains = $mydomain
#relayhost = smtp.servernet.winconnection.net
#relay_recipient_maps = hash:/etc/postfix/relay_recipients
alias_maps = hash:/etc/postfix/aliases
alias_database = hash:/etc/postfix/aliases
#mail_spool_directory = /var/mail
mailbox_command = /usr/bin/procmail
#luser_relay = [email protected]
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
debug_peer_level = 2
#debug_peer_list = 127.0.0.1
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail
newaliases_path = /usr/bin/newaliases
mailq_path = /usr/bin/mailq
setgid_group = postdrop
manpage_directory = /usr/share/man
sample_directory = /etc/postfix/sample
readme_directory = no
append_dot_mydomain = no
mydestination = $myhostname, localhost.$mydomain, $mydomain
myorigin = $mydomain
#########################autenticação#############
smtpd_recipient_restrictions = permit_mynetworks
check_sender_access hash:/etc/postfix/sender_access
reject_unknown_client
check_relay_domains

/etc/postfix/sender_access

[email protected] ok

Estou conseguindo enviar e receber e-mail de dentro e de fora da rede do postfix instalado. O que ocorre é o seguinte: Se tento enviar e-mail para o ig ou terra dá a seguinte mensagem no meu server postfix.

"connect to mx.terra.com.br[200.154.55.2]: server refused mail service"

"connect to mx.ig.com.br[200.226.132.20]: server dropped connection without sending the initial greeting"

Meu relay será que está aberto? O que posso fazer para resolver isso?
Desde já agradeço a todos do forum.