Server replied: 451 4.3.5 Server configuration error

Hello,

I get a server error when trying to send email through squirelmail …

the error is : Server replied: 451 4.3.5 Server configuration error

I got this in my postconf -n

alias_database = hash:/etc/aliases

alias_maps = hash:/etc/aliases

brokensaslauth_clients = yes

command_directory = /usr/sbin

config_directory = /etc/postfix

daemon_directory = /usr/libexec/postfix

debugpeerlevel = 2

home_mailbox = Maildir/

html_directory = no

inet_interfaces = all

localrecipientmaps = $alias_maps

mail_owner = postfix

mailbox_command =

mailq_path = /usr/bin/mailq.postfix

manpage_directory = /usr/share/man

mydomain = mydomain.com

myhostname = mail.mydomain.com

mynetworks = 127.0.0.0/8

mynetworks_style = host

myorigin = $mydomain

newaliases_path = /usr/bin/newaliases.postfix

queue_directory = /var/spool/postfix

readmedirectory = /usr/share/doc/postfix-2.3.3/READMEFILES

sample_directory = /usr/share/doc/postfix-2.3.3/samples

sendmail_path = /usr/sbin/sendmail.postfix

setgid_group = postdrop

smtptlsnotestarttlsoffer = yes

smtpusetls = yes

smtpddelayreject = yes

smtpdhelorequired = yes

smtpdhelorestrictions = permitmynetworks, rejectnonfqdnhelohostname, rejectinvalidhelohostname, permit

smtpdrecipientrestrictions = rejectunauthpipelining, rejectnonfqdnrecipient, rejectunknownrecipientdomain, rejectrblclient zen.spamhaus.org, rejectrblclient bl.spamcop.net, permitmynetworks, checksenderaccess hash:/etc/postfix/senderaccess, rejectunauthdestination, checkpolicy_service unix:postgrey/socket,permit

smtpdsaslauth_enable = yes

smtpdsasllocal_domain =

smtpdsaslsecurity_options = noanonymous

smtpdsenderrestrictions = permitmynetworks, rejectnonfqdnsender, rejectunknownsender_domain, permit

smtpdtlsCAfile = /etc/postfix/ssl/cacert.pem

smtpdtlsauth_only = no

smtpdtlscert_file = /etc/postfix/ssl/smtpd.crt

smtpdtlskey_file = /etc/postfix/ssl/smtpd.key

smtpdtlsloglevel = 1

smtpdtlsreceived_header = yes

smtpdtlssessioncachetimeout = 3600s

smtpdusetls = yes

tlsrandomsource = dev:/dev/urandom

unknownlocalrecipientrejectcode = 550

Please help :(

I was using : http://wiki.centos.org/HowTos/postfix_restrictions

there was an attack using my smtp before and i put it into restrictive mode now it wont do anything.

Can someone help?

Ray