Parameter optimal ditetapkan untuk Postfix “smtpd_recipient_restrictions”

kami mewarisi DNS dari ISP lain dan sekarang server email kami dibom oleh sekitar 1000 email per menit, 99,99% dari email ini hanya spam. Kami mencoba mengoptimalkan pemfilteran / penolakan spam tanpa hasil.

Menurut pendapat Anda, set optimal untuk apa smtpd_recipient_restrictions?

Konfigurasi sistem: Ubuntu + Amavis + Postfix + MySQL + Fail2Ban-Postfix

Saran apa pun dipersilahkan!

UDPATE, 2012-08-08

Pada perubahan konfigurasi posftix sebagai berikut dan mengkonfigurasi layanan Potrgey tingkat spam membusuk 10 kali

smtpd_recipient_restrictions = 
permit_mynetworks, 
permit_sasl_authenticated, 
reject_non_fqdn_hostname, 
reject_invalid_hostname, 
reject_non_fqdn_sender, 
reject_unknown_sender_domain, 
reject_non_fqdn_recipient, 
reject_unknown_recipient_domain, 
check_policy_service inet:127.0.0.1:10023, 
reject_rbl_client zen.spamhaus.org, 
check_recipient_access mysql:/etc/postfix/mysql-virtual_recipient.cf,
reject_unauth_pipelining, 
reject_unauth_destination

Pesanan Anda sangat buruk. Jika Anda ingin menyimpan semuanya dan tidak menambahkan yang lain, urutannya harus:

smtpd_recipient_restrictions = 
permit_mynetworks, 
permit_sasl_authenticated, 
reject_unauth_pipelining, 
reject_invalid_hostname, 
reject_non_fqdn_sender, 
reject_unknown_sender_domain, 
reject_unauth_destination, 
reject_unknown_recipient_domain, 
reject_rbl_client zen.spamhaus.org,
check_recipient_access proxy:mysql:/etc/postfix/mysql-virtual_recipient.cf, 
reject_non_fqdn_recipient

Dan jika itu masih belum cukup, baca postscreendi http://www.postfix.org/POSTSCREEN_README.html .

Saya akan menyarankan smtpd_recipient_restriction mirip dengan yang berikut:

smtpd_recipient_restricdtions = 
# Whitelisting or blacklisting:
check_recipient_access proxy:mysql:/etc/postfix/mysql-virtual_recipient.cf,
# Everyone should play after rules:
reject_non_fqdn_recipient,
reject_non_fqdn_sender,
reject_unknown_recipient_domain,
reject_unknown_sender_domain,
reject_unauth_pipelining,
# Mails from your users:
permit_mynetworks,
permit_sasl_authenticated,
# This will block mails from domains with no reverse DNS record. Will affect both spam and ham mails, but mostly spam. 
reject_unknown_reverse_client_hostname,
# Instead of reject_unknown_reverse_client_hostname you can also use reject_unknown_client_hostname, which is an even harder rule. 
# Reject ugly HELO/EHLO-hostnames (could also affect regular mails):
reject_non_fqdn_hostname,
reject_invalid_helo_hostname,
# Reject everything you're not responsible for:
reject_unauth_destination,
# Only take mails for existing accounts:
reject_unverified_recipient,
# DNS lookups are "expensive", therefore should be at bottom
reject_rbl_client zen.spamhaus.org

Informasi terperinci tentang smtpd_recipient_restrictions dapat ditemukan di sini: http://www.postfix.org/postconf.5.html#smtpd_recipient_restrictions

Mungkin Anda juga ingin menggunakan postgrey , postscreen , postfwd atau daemon kebijakan lainnya .

Dan juga periksa, bahwa Anda menggunakan amavisd-baru Anda dalam mode pra-antrian.