SMTP AUTH를 사용하는 데도 relay-denying 에러가 납니다.

[검색해도 잘 안나와서 이렇게 질문드립니다.꾸벅]

sendmail-8.12.8 입니다.
SMTP AUTH는 잘 되는데..그 다음에 Relay-denying 에러가 납니다.
어디를 더 살펴봐야 하나요..

* 다음은 sendmail 로그입니다. (메일주소는 개인정보라 살짝 바꿨습니다.)

Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 220 host90.wotonet.com ESMTP Sendmail 8.12.8/8.12.8; Thu, 8 Apr 2004 16:14:26 +0900
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: <-- EHLO notebook
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-host90.wotonet.com Hello 211-255-7-130.rev.krline.net [211.255.7.130], pleased to meet you
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-ENHANCEDSTATUSCODES
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-PIPELINING
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-8BITMIME
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-SIZE
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-DSN
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-ETRN
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-AUTH LOGIN PLAIN
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250-DELIVERBY
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250 HELP
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: <-- AUTH LOGIN
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 334 VXNlcm5hbWU6
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 334 UGFzc3dvcmQ6
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 235 2.0.0 OK Authenticated
Apr  8 16:14:26 host90 sendmail[12918]: AUTH=server, relay=211-255-7-130.rev.krline.net [211.255.7.130], authid=m r e n, mech=LOGIN, bits=0
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: <-- MAIL FROM: <m r e n@m r e n.pe.kr>
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 250 2.1.0 <m r e n@m r e n.pe.kr>... Sender ok
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: <-- RCPT TO: <r e s h@chol.com>
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 550 5.7.1 <r e s h@chol.com>... Relaying denied
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: ruleset=check_rcpt, arg1=<r e s h@chol.com>, relay=211-255-7-130.rev.krline.net [211.255.7.130], reject=550 5.7.1 <r e s h@chol.com>... Relaying denied
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: <-- QUIT
Apr  8 16:14:26 host90 sendmail[12918]: i387EQk7012918: --- 221 2.0.0 host90.wotonet.com closing connection