# cd /etc/mail
# vi sendmail.mc
DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')dnl
=> DAEMON_OPTIONS(`Port=smtp,Addr=0.0.0.0, Name=MTA')dnl# m4 sendmail.mc > sendmail.cf
# vi /etc/mail/sendmail.cf
.....# "Smart" relay host (may be null) // ¸ÞÀÏÀ» ´Ù¸¥ ¼¹ö¿¡¼ ¹ß¼ÛÇÒ °æ¿ì
DS smtp.kt.com //ÀÌ ¼¹ö·Î ¸ðµç ¸ÞÀÏÀÌ ¸±·¹À̵Ê
# vi /etc/mail/local-host-names
theko.co.kr //¹ß¼Û µµ¸ÞÀÎ
µ¥¸ó ¸®½ºÅ¸Æ®~