Postfix 국가도메인(TLD) 차단 방법

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Postfix 국가도메인(TLD) 차단 방법

 

xxx.ne.jp에서 피싱 / 스팸 메일이 많이 들어와서 국가도메인을 차단하는 방법을 찾아봤다.
아래 2가지 중에 하나만 적용하면 된다.

1. header_checks

/etc/postfix/main.cf

	header_checks = regexp:/etc/postfix/header_checks
    
/etc/postfix/header_checks

	# Some TLD rejections. Kill entire countries.

	/^Received: ..gt .$/ REJECT Sorry, too much spam from Guatemala
	/^Received: ..tw .$/ REJECT Sorry, too much spam from Taiwan
	/^Received: ..kr .$/ REJECT Sorry, too much spam from Korea
	/^Received: ..cr .$/ REJECT Sorry, too much spam from Costa Rica
	/^Received: ..cn .$/ REJECT Sorry, too much spam from China
	/^Received: ..ru .$/ REJECT Sorry, too much spam from RU
	/^Received: ..br .$/ REJECT Sorry, too much spam from Brazil
	/^Received: ..th .$/ REJECT Sorry, too much spam from Thailand
	/^Received: ..tr .$/ REJECT Sorry, too much spam from Turkey

	# Kill known spamming ISPs
	/^Received: ..dynamic.hinet.net .$/ REJECT Sorry, too much spam from HINET

 

2. check_sender_access

/etc/postfix/main.cf

	smtpd_recipient_restrictions = permit_mynetworks,
	permit_sasl_authenticated,
	reject_unauth_pipelining,
	reject_non_fqdn_recipient,
	reject_unauth_destination,
	check_sender_access hash:/etc/postfix/sender_access,
	reject_rbl_client zen.spamhaus.org

/etc/postfix/sender_access

	/.*\.icu$/ REJECT
	/.*\.cn$/ REJECT