2011. 3. 15. 10:59 컴퓨터이야기/Server

메일이 발송되지 않을 경우

DNS MX 조회를 수행

Windows에서 DNS MX 조회를 수행명령어 nslookup -query=mx gmail.com
Linux/UNIX에서 DNS MX 조회를 수행명령어 host -t mx gmail.com

[handy:/home/handy]$ host -t mx nate.com

nate.com mail is handled by 10 smtp.nate.com.

[handy:/home/handy]$ telnet smtp.nate.com 25

Trying 117.53.114.15...

Connected to smtp.nate.com.

Escape character is '^]'.

220 ESMTP ARGUS Alpha 0.0.2 is ready to Serve. 2.2.2011011213

quit

221 2.0.0 closing connection

Connection closed by foreign host.

[handy:/home/handy]$ host -t mx daum.net

daum.net mail is handled by 10 mx3.hanmail.net.

daum.net mail is handled by 10 mx4.hanmail.net.

daum.net mail is handled by 10 mx5.hanmail.net.

daum.net mail is handled by 10 mx6.hanmail.net.

daum.net mail is handled by 10 mx7.hanmail.net.

daum.net mail is handled by 10 mx8.hanmail.net.

daum.net mail is handled by 10 mx9.hanmail.net.

daum.net mail is handled by 10 mx10.hanmail.net.

daum.net mail is handled by 10 mx1.hanmail.net.

daum.net mail is handled by 10 mx2.hanmail.net.

[handy:/home/handy]$ telnet mx3.hanmail.net 25

Trying 114.108.154.201...

Connected to mx3.hanmail.net.

Escape character is '^]'.

220 rmail-326.daum.net ESMTP welcome to HanMail.Net(tm) ready

421 4.5.0 XTOUT 61.74.67.182: Closing connection by timeout

Connection closed by foreign host.

[handy:/home/handy]$ host -t mx paran.com

paran.com mail is handled by 5 nmailex07.paran.com.

paran.com mail is handled by 5 nmailex08.paran.com.

paran.com mail is handled by 5 nmailex09.paran.com.

paran.com mail is handled by 5 nmailex10.paran.com.

[handy:/home/handy]$ telnet nmailex07.paran.com 25

Trying 211.41.82.136...

Connected to nmailex07.paran.com.

Escape character is '^]'.

220 nmailex07.paran.com ESMTP

quit

221 nmailex07.paran.com

Connection closed by foreign host.

[handy:/home/handy]$ host -t mx gmail.com

gmail.com mail is handled by 20 alt2.gmail-smtp-in.l.google.com.

gmail.com mail is handled by 30 alt3.gmail-smtp-in.l.google.com.

gmail.com mail is handled by 40 alt4.gmail-smtp-in.l.google.com.

gmail.com mail is handled by 5 gmail-smtp-in.l.google.com.

gmail.com mail is handled by 10 alt1.gmail-smtp-in.l.google.com.

[handy:/home/handy]$ telnet alt1.gmail-smtp-in.l.google.com 25

Trying 74.125.95.27...

telnet: connect to address 74.125.95.27:Connection refused

정상적일 경우
Connected 라고 나오고 텔넷으로 연결이 된다.

하지만 문제가 있을 경우
Connection refused 라고 나온다

posted by 변화지시자

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