Postfix Spam Filter

nano /etc/postfix/main.cf เพิ่มลงไปซะ

# SPAM Prevention Below
# Please make sure to keep blacklists up to date.
smtpd_helo_required = yes
non_fqdn_reject_code = 554
relay_domains_reject_code = 554
disable_vrfy_command = yes
strict_rfc821_envelopes = yes
invalid_hostname_reject_code = 554
multi_recipient_bounce_reject_code = 554
unknown_client_reject_code = 554
unknown_sender_reject_code = 554
unknown_address_reject_code = 554
unknown_hostname_reject_code = 554
unknown_virtual_alias_reject_code = 554
unknown_virtual_mailbox_reject_code = 554
unknown_local_recipient_reject_code = 554
unknown_relay_recipient_reject_code = 554
unverified_recipient_reject_code = 554
unverified_sender_reject_code = 554

smtpd_recipient_restrictions = reject_invalid_hostname, reject_non_fqdn_hostname, reject_non_fqdn_recipient, reject_unknown_sender_domain, reject_non_fqdn_sender, reject_unknown_recipient_domain, reject_unauth_pipelining, permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination, reject_rbl_client multi.uribl.com, reject_rbl_client zen.spamhaus.org, reject_rbl_client cbl.abuseat.org, reject_rbl_client bl.spamcop.net, reject_rbl_client sbl.spamhaus.org, reject_rbl_client pbl.spamhaus.org, reject_rbl_client dnsbl.njabl.org, reject_rbl_client whois.rfc-ignorant.org, reject_rbl_client combined.rbl.msrbl.net, permit
smtpd_data_restrictions = reject_unauth_pipelining, permit

/etc/init.d/postfix restart