Борьба со спамом средствами Postfix

/etc/postfix/main.cf

1. Проверка приветствия (HELO)

   smtpd_helo_required = yes
   smtpd_helo_restrictions =
           permit_mynetworks,
           permit_sasl_authenticated,
           reject_unknown_reverse_client_hostname,
           reject_invalid_helo_hostname,
           reject_non_fqdn_helo_hostname,
           reject_unknown_helo_hostname
   

2. Проверка отправителя

   smtpd_sender_restrictions =
           permit_sasl_authenticated,
           permit_mynetworks,
           check_sender_access hash:/etc/mail/access,
           reject_non_fqdn_sender,
           reject_unknown_sender_domain,
           reject_unverified_sender
   

3. Проверка получателя

   smtpd_recipient_restrictions =
           permit_sasl_authenticated,
           check_recipient_access hash:/etc/mail/access,
           permit_mynetworks,
           reject_non_fqdn_recipient,
           reject_unauth_pipelining,
           reject_unauth_destination,
           check_policy_service unix:private/policy-spf,
           reject_unlisted_recipient,
           reject_unverified_recipient,
           check_policy_service inet:127.0.0.1:60000
   

4. Проверка существования адреса отправителя

   address_verify_sender = $double_bounce_sender