sendmail 함 봐주세요..

[zend@server zend]$ /usr/lib/sendmail -v ZIT@shinbiro.com < /dev/null
ZIT@shinbiro.com... Connecting to localhost via relay...
220 localhost.localdomain ESMTP Sendmail 8.12.0/8.12.0; Mon, 7 Apr 2003 13:15:35 +0900
>>> EHLO localhost.localdomain
250-localhost.localdomain Hello localhost.localdomain [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH LOGIN PLAIN
250-DELIVERBY
250 HELP
>>> MAIL From:<zend@localhost.localdomain> AUTH=zend@localhost.localdomain
250 2.1.0 <zend@localhost.localdomain>... Sender ok
>>> RCPT To:<ZIT@shinbiro.com>
>>> DATA
250 2.1.5 <ZIT@shinbiro.com>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 h374FZ4r025545 Message accepted for delivery
ZIT@shinbiro.com... Sent (h374FZ4r025545 Message accepted for delivery)
Closing connection to localhost
>>> QUIT
221 2.0.0 localhost.localdomain closing connection

[zend@server zend]$

sendmail 실행시 이런 메세지가 뜹니다. ..

메일 전송은 안되구요..(외부) 내부는 이상이 없습니다..

설정시 뭐가 잘못되었는지.....아시는 분은 좀 가르쳐 주세요