Postfix x Spammers

Caros colegas,

Já estou entrando em desespero com o meu servidor de email. Tenho um CL10 + postfix e me parece, ele esta sendo alvo de spammers. ja tentei implentar regras anti-spam no meu servidor, mas quando faço isso ele para de enviar mensagens ou parece que as mensagens se perdem.

Gostaria de contar com a ajuda de voces pra resolver meu problema
Segue abaixo o meu main.cf

#soft_bounce = no

queue_directory = /var/spool/postfix

command_directory = /usr/sbin

daemon_directory = /usr/lib/postfix

mail_owner = postfix

default_privs = nobody

#myhostname = host.domain.tld

myhostname = email

mydomain = macavi.com.br

#myorigin = $myhostname
myorigin = $mydomain

#inet_interfaces = all
#inet_interfaces = $myhostname
inet_interfaces = $myhostname, localhost

#proxy_interfaces =
#proxy_interfaces = 1.2.3.4

#mydestination = $myhostname, localhost.$mydomain
#mydestination = $myhostname, localhost.$mydomain $mydomain
mydestination = $myhostname, localhost.$mydomain, $mydomain,
mail.$mydomain, www.$mydomain, ftp.$mydomain

#local_recipient_maps = unix:passwd.byname $alias_maps

#local_recipient_maps = proxy:unix:passwd.byname $alias_maps

#local_recipient_maps =

default_transport = smtp

#unknown_local_recipient_reject_code = 550

unknown_local_recipient_reject_code = 450

#mynetworks_style = class

#mynetworks_style = subnet

#mynetworks_style = host

mynetworks = 168.100.189.0/28, 127.0.0.0/8 , 200.217.162.42, 10.85.8.0/21, 200.253.0.0/24 , 200.164.0.0/24, 200.196.0.0/24, 201.4.0.0/29, 201.9.0.0/24, 201.8.0.0/24, 200.166.0.0/24 , 200.223.0.0/24, 200.150.129.142, 200.150.0.0/24,200.217.249.190, 200.164.90.251, 200.167.172.62

#mynetworks = $config_directory/mynetwor

#mynetworks = hash:/etc/postfix/network_table

relay_domains = $mydestination, wisephoto.com.br, madecenter.com.br, olico.com.br, postoimperial.com.br, terra.com.br, vicari.com.br, grupoibanez.com.br, palletdobrasil.com.br, cefetleo.com.br, hcpneus.com.br, telemar.com.br, wrmpallets.com.br, setnet.com.br, fluxus.com.br, alltec.com.br, microsiga.com.br, optiomumbrasil.com, alterdata.com.br, garantech.com.br, baydenet.com.br , lamb.com.br, martex.com.br, evolucao.com.br, radnai.com.br, vppropaganda.com.br, mallory.com.br ,ligtelecon.net, fortalnet.com.br, hotmail.com.br, hotmail.com, secrel.com.br, acoforte.com.br, uol.com.br, seitac.org.br , ortolite.com.br, yahoo.com.br, yahoo.com, gmail.com, bol.com.br, gradiente.com.br, ig.com.br, globo.com, timnordeste.com.br, claro.com.br, oi.com.br, ibest.com.br, pop.com.br, click21.com.br, odontosystem.com.br, norautocaminhoes.com.br, veloxmail.com.br, itautech-philco.com.br, oic.com.br, novamad.com.br, packpallets.com.br, multibras.com.br

#relayhost = $mydomain

#relayhost = gateway.my.domain

#relayhost = uucphost

#relayhost = [an.ip.add.ress]

#in_flow_delay = 1s

#alias_maps = dbm:/etc/aliases

alias_maps = hash:/etc/postfix/aliases

#alias_maps = hash:/etc/aliases, nis:mail.aliases

#alias_maps = netinfo:/aliases

#alias_database = dbm:/etc/aliases

alias_database = hash:/etc/postfix/aliases

#alias_database = hash:/etc/aliases

#alias_database = hash:/etc/aliases, hash:/opt/majordomo/aliases

#recipient_delimiter = +

#home_mailbox = Mailbox

#home_mailbox = Maildir/

#mail_spool_directory = /var/mail

#mail_spool_directory = /var/spool/mail

mailbox_command = /usr/bin/procmail

#mailbox_command = /some/where/procmail -a "$EXTENSION"

#mailbox_transport = lmtp:unix:/file/name

#mailbox_transport = cyrus

#fallback_transport = lmtp:unix:/file/name

#fallback_transport = cyrus

#fallback_transport =

#luser_relay = [email protected]

#luser_relay = [email protected]

#luser_relay = admin+$local

#header_checks = regexp:/etc/postfix/header_checks

#fast_flush_domains = $relay_domains

#fast_flush_domains =

#smtpd_banner = $myhostname ESMTP $mail_name

smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)

#local_destination_concurrency_limit = 2

#default_destination_concurrency_limit = 20

debug_peer_level = 2

#debug_peer_list = 127.0.0.1

#debug_peer_list = some.domain

debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5

# debugger_command =
# PATH=/bin:/usr/bin:/usr/local/bin; export PATH; (echo cont;
# echo where) | gdb $daemon_directory/$process_name $process_id 2>&1

# >$config_directory/$process_name.$process_id.log & 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

command_time_limit = 1h

smtpd_helo_required = yes

smtpd_client_restrictions =
permit_mynetworks
permit

smtpd_sender_restriocions =
permit_mynetworks
reject_non_fpdn_sender
reject_unknown_sender_domain
permit

smtpd_recipient_restrictions =
permit_mynetworks
reject_non_fqdn_sender
reject_non_fqdn_recipient
reject_unknown_sender_domain
reject_unknown_recipient_domain
reject_invalid_hostname
reject_non_fqdn_hostname
reject_spf_invalid_sender
reject_rbl_client bl.spamcop.net
reject_rbl_client rbl-xbl.spamhaus.org
reject_rbl_client relays.ordb.org
reject_rbl_client opm.blitset.org
reject_rbl_client list.dsbl.org
reject_rbl_client rbl.spamhaus.org
reject_rbl_client cbl.abuseat.org
reject_rbl_client dul.dnsbl.sorbs.net
permit

Por favor me ajudem
Certo de suas ajudas !!!!

Emerson