메일반송 reason: 550 5.7.1 Service unavailable; Client host [xxx

1. 외부로 메일 발송시  mailq 에 쌓이게 됨 (네이버,hp등)
  ** 로컬에서는 잘 들어오고 daum, msn.com 등도 잘 나가는 상태임

-------------  maillog 내용 ------------------
Feb  4 12:13:46 ns1 ipop3d[4804]: Mailbox vulnerable - directory /var/spool/mail must have 1777 protection
Feb  4 12:13:46 ns1 ipop3d[4804]: Login user=kylee host=www.raoninfo.co.kr [xxx.xxx.xxx.95] nmsgs=0/0
Feb  4 12:13:46 ns1 ipop3d[4804]: Mailbox vulnerable - directory /var/spool/mail must have 1777 protection
Feb  4 12:13:46 ns1 ipop3d[4804]: Logout user=kylee host=www.raoninfo.co.kr [xxx.xxx.xxx.95] nmsgs=0 ndele=0
Feb  4 12:14:12 ns1 ipop3d[4805]: pop3 service init from xxx.xxx.xxx.95
Feb  4 12:06:59 ns1 sendmail[4775]: m141uLof004478: to=<내 네이버id@naver.com>, ctladdr=<test1@123.co.kr> (512/513), delay=01:10:31, xdelay=00:10:10, mailer=esmtp, pri=301273, relay=rcvmail10.naver.com. [220.95.237.142], dsn=4.0.0, stat=Deferred: Connection timed out with rcvmail10.naver.com.

2. 외부메일 수신시 네이버, msn, daum, 등 들어오는 같으나 제대로 들어오는지 모르겠습니다...
   제가 test 하면 잘 들어오는데 potal 에서만 들어오는지 모르겠습니다.

# mailq

                /var/spool/mqueue (2 requests)
-----Q-ID----- --Size-- -----Q-Time----- ------------Sender/Recipient-----------
m141uLof004478*     823 Mon Feb  4 10:56 <test1@123.co.kr>
                 (Deferred: Connection timed out with rcvmail10.naver.com.)
                                         <내 네이버id@naver.com>    Total requests: 1

이런식으로 쌓이게 됩니다. 포트는 열려있습니다.

]# netstat -nat | grep LISTEN | grep 25
tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN     
]#
]# netstat -nat | grep LISTEN | grep 25
tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN 

3. 스팸 설정 확인을 위해 아래 사이트에서 해당 저희 회사 ip 로 조회시.... 나오는 출력입니다.

------------http://www.mail-abuse.com/cgi-bin/lookup?ip_address=xxx.xxx.xxx.95 조회

The IP address entered was not found on any database managed by Trend Micro's Network Reputation Services.

Please note: These databases are based on IP addresses; they do not use host or domain names.

----------http://www.spamhaus.org/lookup.lasso  검색시 IP Address Lookup

 
xxx.xxx.xxx.95 is not listed in the SBL

xxx.xxx.xxx.95 is not listed in the PBL

xxx.xxx.xxx.95 is not listed in the XBL

-------------아래는 반송메일 내용 ------------

The original message was received at Thu, 31 Jan 2008 10:19:11 +0900
from www.123.co.kr [xxx.xxx.xxx.95]

   ----- The following addresses had permanent fatal errors -----
<choon@hp.com>
    (reason: 550 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.95] blocked using Trend Micro RBL+. Please s...icro Email Reputation database. Please see <http://www.mail-abuse.com/cgi-bin/lookup?xxx.xxx.xxx.95>)

   ----- Transcript of session follows -----
... while talking to smtp.hp.com.:
>>> DATA
<<< 550 5.7.1 Service unavailable; Client host [221.158.189.95] blocked using Trend Micro RBL+. Please see http://www.mail-abuse.com/cgi-bin/lookup?ip_address=xxx.xxx.xxx.95; Mail from 221.158.189.95 blocked using Trend Micro Email Reputation database. Please see <http://www.mail-abuse.com/cgi-bin/lookup?xxx.xxx.xxx.95>
550 5.1.1 <choon@hp.com>... User unknown
<<< 554 5.5.1 Error: no valid recipients

주절주절 써놓았는데 어떻게 해야할지 모르겠습니다..
도와주십시요.. ㅠㅠ;;