Nov 25 12:39:09 www sendmail[4583]: gAP3d1wU004583: to=root, ctladdr=root (0/0), delay=00:00:08, xdelay=00:00:08, mail
er=relay, pri=30183, relay=localhost, dsn=5.1.2, stat=Host unknown (Name server: localhost: non-recoverable error)  위
와 같이 에러로그가 남는데요.. 어디를 수정해야 할지??