sendmail.mc 수정
[ Korean White Domain 설정시]
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					 1 2  | 
						FEATURE(dnsbl, `blackholes.mail-abuse.org', `Rejected - see http://www.mail-abuse.org/rbl/')dnl FEATURE(dnsbl, `spamlist.or.kr', `Rejected - see http://www.kisarbl.or.kr/')dnl  | 
					
[Spam Filtering 해외 블랙 도메인 설정시]
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					 1 2  | 
						FEATURE(`dnsbl', `relays.ordb.org', `"Rejected due to Open Relay see http://www.ordb.org/lookup/?host=" $&{clientaddr} " for more information"')dnl FEATURE(`dnsbl', `sbl.spamhaus.org', `"Rejected due to Spamhaus listing see http://www.abuse.net/sbl.phtml?IP=" $&{clientaddr} " for more information"')dnlnl  | 
					
[To stop accepting E-mail from unresolvable domains ]
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					 1  | 
						FEATURE(`accept_unresolvable_domains')dnl  | 
					
