sendmail 로컬에서는 되는데, 외부로 메일이 발송되지 않습니다.

로컬에서는 메일전송,확인됩니다.
외부로 sendmail 발송하면 메일이 발송되지 않습니다.
외부로 메일을 발송하면
------------------------------------------------------------------------------
& mail aaa@hotmail.com
Subject : 테스트합니다.
내용입니다~
.
EOT
&
------------------------------------------------------------------------------
발송되지않고 아래와 같은 메일이 도착합니다~

    **********************************************
    **      THIS IS A WARNING MESSAGE ONLY      **
    **  YOU DO NOT NEED TO RESEND YOUR MESSAGE  **
    **********************************************

The original message was received at Sat, 31 Oct 2009 14:18:09 +0900
from localhost [127.0.0.1]

   ----- Transcript of session follows -----
<youdw@hotmail.com>... Deferred: Connection timed out with mx1.hotmail.com.
Warning: message still undelivered after 4 hours
Will keep trying until message is 5 days old

Part 2:
Content-Type: message/delivery-status

Part 3:
Content-Type: message/rfc822

From root@youdw Sat Oct 31 14:18:09 2009
Return-Path: <root@youdw>
From: root <root@youdw>
Date: Sat, 31 Oct 2009 14:18:08 +0900
To: youdw@hotmail.com
Subject: 테스트합니다.
User-Agent: Heirloom mailx 12.4 7/29/08
Content-Type: text/plain; charset=us-ascii

내용입니다~
------------------------------------------------------------------------------
------------------------------------------------------------------------------
sendmail -v하면 아래와 같이 뜹니다.
무엇이 문제인지 도저히 모르겠습니다.
도움바랍니다~
ㅡㅡ;;;


[root@youdw ~]# sendmail -v aaa@hotmail.com
WARNING: local host name (youdw) is not qualified; see cf/README: WHO AM I?
aaa@hotmail.com... Connecting to [127.0.0.1] via relay...
220 youdw ESMTP Sendmail 8.14.3/8.14.3; Tue, 3 Nov 2009 14:28:06 +0900
>>> EHLO youdw
250-youdw Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH DIGEST-MD5 CRAM-MD5 LOGIN PLAIN
250-DELIVERBY
250 HELP
>>> MAIL From:<youdw@youdw> AUTH=youdw@youdw
250 2.1.0 <youdw@youdw>... Sender ok
>>> RCPT To:<aaa@hotmail.com>
>>> DATA
250 2.1.5 <aaa@hotmail.com>... Recipient ok
354 Enter mail, end with "." on a line by itself
>>> .
250 2.0.0 nA35S6xK011032 Message accepted for delivery
aaa@hotmail.com... Sent (nA35S6xK011032 Message accepted for delivery)
Closing connection to [127.0.0.1]
>>> QUIT
221 2.0.0 youdw closing connection