root로 오는 메일

검색을 해봐도 잘 모르겠네요....
root로 메일이 오는데 무슨뜻인지 잘 모르겠어요.. 아시는분 부탁드립니다

====메일 내용===

----- Original Message -----
From: "root" <root@ns.xxxxxxx.xxx>
To: <root@ns.xxxxxxx.xxx>
Sent: Tuesday, September 14, 2004 4:02 AM
Subject: LogWatch for ns.xxxxxxx.xxx

>
>
> ################## LogWatch 2.6 Begin #####################
>
> --------------------- Named Begin ------------------------
>
> **Unmatched Entries**
> lame server resolving '197.231.231.203.in-addr.arpa' (in '231.231.203.in-addr.arpa'?): 211.115.194.2#53: 4 Time(s)
> lame server resolving '197.231.231.203.in-addr.arpa' (in '231.231.203.in-addr.arpa'?): 211.115.194.3#53: 4 Time(s)
> lame server resolving 'cadalog.co.kr' (in 'cadalog.co.kr'?): 211.47.66.37#53: 1 Time(s)
> lame server resolving 'idlook.co.kr' (in 'idlook.co.kr'?): 211.216.50.160#53: 1 Time(s)
> lame server resolving 'mail.itembiz.com' (in 'itembiz.com'?): 210.219.252.210#53: 1 Time(s)
> lame server resolving 'moe.go.kr' (in 'moe.go.kr'?): 211.216.50.150#53: 1 Time(s)
>
>
> ---------------------- Named End -------------------------
>
>
>
> --------------------- sendmail Begin ------------------------
>
> 1365737 bytes transferred
> 129 messages sent
>
> Unknown users:
> kevin@xxxxxxx.xxx: 1 Times(s)
> bob@xxxxxxx.xxx: 2 Times(s)
> alex@xxxxxxx.xxx: 3 Times(s)
> james@xxxxxxx.xxx: 2 Times(s)
> bill@xxxxxxx.xxx: 1 Times(s)
> sales@xxxxxxx.xxx: 5 Times(s)
> peter@xxxxxxx.xxx: 2 Times(s)
> sam@xxxxxxx.xxx: 3 Times(s)
> tom@xxxxxxx.xxx: 2 Times(s)
> john@xxxxxxx.xxx: 1 Times(s)
> stan@xxxxxxx.xxx: 3 Times(s)
>
>
> **Unmatched Entries**
>
> i8CFf5EW012308: ruleset=check_mail, arg1=<203.155.9.158:80|?|?|?|?|?|?|?|?>, relay=[222.104.194.91], reject=553 5.5.4 <203.155.9.158:80|?|?|?|?|?|?|?|?>... Domain name required for sender address 203.155.9.158:80|?|?|?|?|?|?|?|?
> i8D0hZEW013116: [220.122.140.122] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA
> i8D4e4EW013351: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D4ifEW013352: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D4jgEW013355: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D4mQEW013356: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D50mEW013375: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D5DSEW013391: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D5N4EW013399: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D5ZmEW013413: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D60sEW013441: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D6AjEW013451: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D6BXEW013452: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D6J2EW013458: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D6OPEW013466: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D6dJEW013476: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D86LEW013561: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D86bEW013562: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D87eEW013563: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D89GEW013564: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D8AuEW013570: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D8IAEW013573: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D8NaEW013581: lost input channel from [210.205.226.25] to MTA after rcpt
> i8D95wEW013617: lost input channel from [203.231.231.197] to MTA after data
> i8D9FLEW013625: ruleset=check_mail, arg1=<200.56.224.208:80>, relay=[211.224.145.231], reject=553 5.5.4 <200.56.224.208:80>... Domain name required for sender address 200.56.224.208:80
>
> ---------------------- sendmail End -------------------------
>
>
> ###################### LogWatch End #########################

이런메일이 계속 주기적으로 오네요
혹시.. 누군가 relay하는 거인가요? ㅜ.ㅡ 이제 막 서버를 맡아서
아는게 하나도 없네요..부탁드림다..