불과 재작년까지만 하더라도 메일서버 오픈 릴레이로 인해 차단되는 메일 서버가 적잖았습니다. 요즘은 거의 없다시피 하지만 만일을 위해 또는 신규 메일서버 설정후 오픈 릴레이 테스트를 진행 해보는게 좋겠습니다.

개인적으로 운영하고 있는 메일서버가 무려 7개 패턴에서 릴레이가 허용됨을 확인 할 수 있었습니다.

http://www.rbl.jp/svcheck.php 에 접속하여 Hostname 에 메일서버 주소를 입력 합니다.

[Check] 버튼을 클릭하면 아래와 같이 총 19단계의 테스트가 이뤄집니다.

참고로 위 사이트에서는 하루에 1번만 테스트가 가능 하답니다.

Connecting to your.mailServer.com for test ...

<<< 220 your.mailServer.com ESMTP
>>> HELO h.rbl.jp
<<< 250 your.mailServer.com

Relay test 0
>>> RSET
<<< 250 flushed
>>> MAIL FROM: <rlychk@h.rbl.jp>
<<< 250 ok
>>> RCPT TO: <rlytest@rbl.jp>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
relay NOT accepted!!

Relay test 1
>>> RSET
<<< 250 flushed
>>> MAIL FROM: <rlychk>
<<< 250 ok
>>> RCPT TO: <rlytest@h.rbl.jp>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
relay NOT accepted!!

Relay test 2
>>> RSET
<<< 250 flushed
>>> MAIL FROM: <>
<<< 250 ok
>>> RCPT TO: <rlytest@h.rbl.jp>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
relay NOT accepted!!

Relay test 3
>>> RSET
<<< 250 flushed
>>> MAIL FROM: <rlychk@your.mailServer.com>
<<< 250 ok
>>> RCPT TO: <rlytest@h.rbl.jp>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
relay NOT accepted!!

Relay test 4
>>> RSET
<<< 250 flushed
>>> MAIL FROM: <rlychk@[211.110.11.45]>
<<< 250 ok
>>> RCPT TO: <rlytest@h.rbl.jp>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
relay NOT accepted!!

Relay test 5
>>> RSET
<<< 250 flushed
>>> MAIL FROM: <rlychk@your.mailServer.com>
<<< 250 ok
>>> RCPT TO: <rlytest%h.rbl.jp@your.mailServer.com>
<<< 553 sorry, that domain isn't in my list of allowed rcpthosts (#5.7.1)
relay NOT accepted!!

Relay test 6
>>> RSET
<<< 250 flushed
>>> MAIL FROM: <rlychk@your.mailServer.com>
<<< 250 ok
>>> RCPT TO: <rlytest%h.rbl.jp@[211.110.11.45]>
<<< 250 ok
relay accepted!! <-- 열려 있네요..

.
.
.

Closing connection ...
>>> QUIT
<<< 221 your.mailServer.com

Relay test result
All tests performed, 7 relays accepted.