root 계정으로 자꾸 이상한 메일이..ㅜ.ㅜ

============첫번째====================================================================

----- Original Message -----
From: "root" <root@xxx.xxx>
To: <root@xxx.xxx>
Sent: Friday, September 24, 2004 4:02 AM
Subject: LogWatch for xxxx.xxx

>
>
>  ################## LogWatch 2.6 Begin #####################
>
>  --------------------- Named Begin ------------------------
>
> **Unmatched Entries**
>    lame server resolving '125.4.116.210.in-addr.arpa' (in '4.116.210.in-addr.arpa'?): 210.116.105.164#53: 8 Time(s)
>    lame server resolving '125.4.116.210.in-addr.arpa' (in '4.116.210.in-addr.arpa'?): 210.116.96.164#53: 8 Time(s)
>    lame server resolving 'ditco.com' (in 'ditco.com'?): 203.255.112.34#53: 1 Time(s)
>    lame server resolving 'provin.jeju.kr' (in 'provin.jeju.kr'?): 210.104.1.3#53: 1 Time(s)
>    lame server resolving 'provin.jeju.kr' (in 'provin.jeju.kr'?): 211.216.50.150#53: 1 Time(s)
>
>
>  ---------------------- Named End -------------------------
>
>
>
>  --------------------- sendmail Begin ------------------------
>
> 910802 bytes transferred
> 83 messages sent
>
> **Unmatched Entries**
>
> i8MHKVEW005387: ruleset=check_mail, arg1=<61.254.215.200>, relay=[211.194.243.226], reject=553 5.5.4 <61.254.215.200>... Domain name required for sender address 61.254.215.200
> i8MLWfEW005936: ruleset=check_rcpt, arg1=<btwilling@cox.net>, relay=slip-12-65-120-206.mis.prserv.net [12.65.120.206], reject=550 5.7.1 <btwilling@cox.net>... Relaying denied. Proper authentication required.
> i8N2gbEW006214: ruleset=check_rcpt, arg1=<talent311@hanmail.net>, relay=[222.101.164.151], reject=550 5.7.1 <talent311@hanmail.net>... Relaying denied. IP name lookup failed [222.101.164.151]
> i8N7OPEW006455: ruleset=check_mail, arg1=<66.135.229.56>, relay=[211.107.111.245], reject=553 5.5.4 <66.135.229.56>... Domain name required for sender address 66.135.229.56
> i8NBUeEW006685: ruleset=check_rcpt, arg1=<datavan@lycos.co.kr>, relay=[218.145.251.93], reject=550 5.7.1 <datavan@lycos.co.kr>... Relaying denied. IP name lookup failed [218.145.251.93]
> i8NBUeEW006685: lost input channel from [218.145.251.93] to MTA after rcpt
>
>  ---------------------- sendmail End -------------------------
>
>
>  ###################### LogWatch End #########################

===================두번째=============================================================

----- 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 오는데 왜 이런지 아시는 분.. 좀 알려주세요..ㅜ.ㅜ