全て sendmail 動作中
local001.localserver200 : 192.168.38.222 nl.localserver200 : 192.168.38.133 ( user100.server100.info ) jrijri.no-ip.info :192.168.38.199
まず telnet で 接続して ほかから 他へ
mail from:smtp2001soho@jippahoo.dog.land 送信 rcpt to:otheraaaa@ax.qc.com 受取人
の 場合
# telnet 192.168.38.222 25 Trying 192.168.38.222... Connected to 192.168.38.222. Escape character is '^]'. 220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 09:58:19 +0900 helo smtp2001soho 250 local001.localserver200 Hello root@local001.localserver200 [192.168.38.222], pleased to meet you mail from:smtp2001soho@jippahoo.dog.land 250 2.1.0 smtp2001soho@jippahoo.dog.land... Sender ok rcpt to:otheraaaa@ax.qc.com 250 2.1.5 otheraaaa@ax.qc.com... Recipient ok data 354 Enter mail, end with "." on a line by itself helo test . 250 2.0.0 k9S0wJ8I000313 Message accepted for delivery quit 221 2.0.0 local001.localserver200 closing connection Connection closed by foreign host. /* ******** 送られてしまった ********************* */ # cat messages Oct 28 09:58:19 local001 identd[315]: Connection from local001.localserver200 Oct 28 09:58:19 local001 identd[315]: from: 192.168.38.222 ( local001.localserver200 ) for: 32777, 25 Oct 28 09:59:58 local001 sendmail[313]: k9S0wJ8I000313: from=smtp2001soho@jippahoo.dog.land, size=10, class=0, nrcpts=1, msgid=<200610280059.k9S0wJ8I000313@local001.localserver200>, proto=SMTP, daemon=MTA, relay=root@local001.localserver200 [192.168.38.222] Oct 28 10:00:05 local001 sendmail[317]: k9S0wJ8I000313: to=otheraaaa@ax.qc.com, delay=00:00:29, xdelay=00:00:07, mailer=esmtp, pri=30010, relay=mxzoter.qc.com. [444.444.444.444], dsn=2.0.0, stat=Sent (JAA06546 Message accepted for delivery)
ななんと 送られてしまった これで良いのか？
まず telnet で 接続して ほかから 他へ
catland.local001.localserver200 送信 rcpt to:cell222@deferred.ne.ni 受取人
の 場合
# telnet 192.168.38.222 25 Trying 192.168.38.222... Connected to 192.168.38.222. Escape character is '^]'. 220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 10:07:44 +0900 helo cell222@deferred.ne.ni 501 5.0.0 Invalid domain name helo cell222 250 local001.localserver200 Hello root@local001.localserver200 [192.168.38.222], pleased to meet you mail from :catland.local001.localserver200 553 5.5.4 catland.local001.localserver200... Domain name required for sender address catland.local001.localserver200 mail from:catnyan@user100.server100.info 250 2.1.0 catnyan@user100.server100.info... Sender ok rcpt to:cell222@deferred.ne.ni 250 2.1.5 cell222@deferred.ne.ni... Recipient ok data 354 Enter mail, end with "." on a line by itself Subject : Why I cannot send soon? 2006G/107n28F| (EZ) 10:10:38 JST test mail from nyantarou . 250 2.0.0 k9S17i1I000331 Message accepted for delivery quit 221 2.0.0 local001.localserver200 closing connection Connection closed by foreign host. /* とにかくも 受け付けは 完了した 受信というか 相手が 受け付けてくれるは 別として */ # cat messages Oct 28 10:07:44 local001 identd[332]: Connection from local001.localserver200 Oct 28 10:07:44 local001 identd[332]: from: 192.168.38.222 ( local001.localserver200 ) for: 32793, 25 Oct 28 10:08:52 local001 sendmail[331]: k9S17i1I000331: ruleset=check_mail, arg1=catland.local001.localserver200, relay=root@local001.localserver200 [192.168.38.222], reject=553 5.5.4 catland.local001.localserver200... Domain name required for sender address catland.local001.localserver200 /* 最初けられた部分 これから 送信モード */ Oct 28 10:11:01 local001 sendmail[331]: k9S17i1I000331: from=catnyan@user100.server100.info, size=93, class=0, nrcpts=1, msgid=<200610280109.k9S17i1I000331@local001.localserver200>, proto=SMTP, daemon=MTA, relay=root@local001.localserver200 [192.168.38.222] Oct 28 10:11:01 local001 sendmail[336]: k9S17i1I000331: to=cell222@deferred.ne.ni, delay=00:01:16, xdelay=00:00:00, mailer=esmtp, pri=30093, relay=mtfbo.deferred.ne.ni. [888.777.666.333], dsn=4.0.0, stat=Deferred: Connection refused by mtfbo.deferred.ne.ni. # ls -l /var/spool/mqueue/ total 8 -rw------- 1 root smmsp 58 Oct 28 10:11 dfk9S17i1I000331 -rw------- 1 root smmsp 743 Oct 28 10:11 qfk9S17i1I000331 /* 一応受理はされているが stat=Deferred の 状態 */
同様な条件で もう一つ
# telnet 192.168.38.222 25 Trying 192.168.38.222... Connected to 192.168.38.222. Escape character is '^]'. 220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 10:18:39 +0900 helo qtest 250 local001.localserver200 Hello root@local001.localserver200 [192.168.38.222], pleased to meet you mail from:tama@deferred.ne.ni 250 2.1.0 tama@deferred.ne.ni... Sender ok rcpt to:cell222@deferred.ne.ni 250 2.1.5 cell222@deferred.ne.ni... Recipient ok data 354 Enter mail, end with "." on a line by itself Subject:$*$+$$$b$N $3$l$O ;n83$G$9 test here is test . 250 2.0.0 k9S1IdsU000351 Message accepted for delivery quit 221 2.0.0 local001.localserver200 closing connection Connection closed by foreign host. # cat messages Oct 28 10:18:39 local001 identd[353]: Connection from local001.localserver200 Oct 28 10:18:39 local001 identd[353]: from: 192.168.38.222 ( local001.localserver200 ) for: 32798, 25 Oct 28 10:20:34 local001 sendmail[351]: k9S1IdsU000351: from=tama@deferred.ne.ni, size=55, class=0, nrcpts=1, msgid=<200610280119.k9S1IdsU000351@local001.localserver200>, proto=SMTP, daemon=MTA, relay=root@local001.localserver200 [192.168.38.222] Oct 28 10:20:34 local001 sendmail[356]: k9S1IdsU000351: to=cell222@deferred.ne.ni, delay=00:00:59, xdelay=00:00:00, mailer=esmtp, pri=30055, relay=mtfbo.deferred.ne.ni. [888.777.666.333], dsn=4.0.0, stat=Deferred: Connection refused by mtfbo.deferred.ne.ni. # ls -l /var/spool/mqueue/ total 16 -rw------- 1 root smmsp 58 Oct 28 10:11 dfk9S17i1I000331 -rw------- 1 root smmsp 35 Oct 28 10:20 dfk9S1IdsU000351 -rw------- 1 root smmsp 719 Oct 28 10:17 qfk9S17i1I000331 -rw------- 1 root smmsp 668 Oct 28 10:20 qfk9S1IdsU000351 /* しばらくして */ # cat messages Oct 28 10:32:05 local001 sendmail[374]: k9S1IdsU000351: to=cell222@deferred.ne.ni, delay=00:12:30, xdelay=00:00:00, mailer=esmtp, pri=120055, relay=mtfbo.deferred.ne.ni. [888.777.666.333], dsn=4.0.0, stat=Deferred: Connection refused by mtfbo.deferred.ne.ni. Oct 28 10:32:05 local001 sendmail[374]: k9S17i1I000331: to=cell222@deferred.ne.ni, delay=00:22:20, xdelay=00:00:00, mailer=esmtp, pri=210093, relay=mtfbo.deferred.ne.ni., dsn=4.0.0, stat=Deferred: Connection refused by mtfbo.deferred.ne.ni. Oct 28 10:47:06 local001 sendmail[380]: k9S1IdsU000351: to=cell222@deferred.ne.ni, delay=00:27:31, xdelay=00:00:00, mailer=esmtp, pri=210055, relay=mtfbo.deferred.ne.ni. [888.777.666.333], dsn=4.0.0, stat=Deferred: Connection refused by mtfbo.deferred.ne.ni. Oct 28 10:47:06 local001 sendmail[380]: k9S17i1I000331: to=cell222@deferred.ne.ni, delay=00:37:21, xdelay=00:00:00, mailer=esmtp, pri=300093, relay=mtfbo.deferred.ne.ni., dsn=4.0.0, stat=Deferred: Connection refused by mtfbo.deferred.ne.ni. /* 見込みが ないので 削除 する */ # rm /var/spool/mqueue/* # ls -l /var/spool/mqueue/ total 0
送信された 中身を 確認した場合
# telnet 192.168.38.222 25
Trying 192.168.38.222...
Connected to 192.168.38.222.
Escape character is '^]'.
220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 10:22:29 +0900
helo pp
250 local001.localserver200 Hello
root@local001.localserver200 [192.168.38.222], pleased to meet you
mail from:test@user100.server100.info
250 2.1.0 test@user100.server100.info... Sender ok
rcpt to:otusr111@ekisaito.ko.ni
250 2.1.5 otusr111@ekisaito.ko.ni... Recipient ok
data
354 Enter mail, end with "." on a line by itself
Subject:test fake
this is fake test from local
.
250 2.0.0 k9S1MT6D000364 Message accepted for delivery
quit
221 2.0.0 local001.localserver200 closing connection
Connection closed by foreign host.
# cat messages
Oct 28 10:22:29 local001 identd[366]: Connection from local001.localserver200
Oct 28 10:22:29 local001 identd[366]:
from: 192.168.38.222 ( local001.localserver200 ) for: 32801, 25
Oct 28 10:23:49 local001 sendmail[364]: k9S1MT6D000364:
from=test@user100.server100.info, size=48, class=0, nrcpts=1,
msgid=<200610280123.k9S1MT6D000364@local001.localserver200>,
proto=SMTP, daemon=MTA, relay=root@local001.localserver200 [192.168.38.222]
Oct 28 10:23:50 local001 sendmail[368]: k9S1MT6D000364:
to=otusr111@ekisaito.ko.ni, delay=00:00:38, xdelay=00:00:01,
mailer=esmtp, pri=30048, relay=mail.ekisaito.ko.ni. [333.444.555.666],
dsn=2.0.0, stat=Sent (ok 1161998630 qp 69794)
Oct 28 10:27:28 nyanta sendmail[521]: k9S1RPU2000521:
from=<otusr111@ekisaito.ko.ni>, size=548, class=0, nrcpts=1,
msgid=<20061028012714.91966.qmail@asp111.mail.ekisaito.ko.ni>,
proto=SMTP, daemon=MTA, relay=mail.ekisaito.ko.ni [333.444.555.666]
Oct 28 10:27:28 nyanta sendmail[522]: k9S1RPU2000521:
to=<mailuser555@user100.server100.info>,
delay=00:00:01, xdelay=00:00:00, mailer=local, pri=30755, dsn=2.0.0, stat=Sent
# cat /var/spool/mail/mailuser555
From otusr111@ekisaito.ko.ni Sat Oct 28 10:27:28 2006
Return-Path: <otusr111@ekisaito.ko.ni>
Received: from mail.ekisaito.ko.ni (mail.ekisaito.ko.ni [333.444.555.666])
by user100.server100.info (8.13.4/8.13.4) with SMTP id k9S1RPU2000521
for <mailuser555@user100.server100.info>; Sat, 28 Oct 2006 10:27:27 +0900
Received: (qmail 91967 invoked by uid 65534); 28 Oct 2006 10:27:14 +0900
Date: 28 Oct 2006 10:27:14 +0900
Message-ID: <20061028012714.91966.qmail@asp111.mail.ekisaito.ko.ni>
From: <otusr111@ekisaito.ko.ni>
To: mailuser555@user100.server100.info
Subject: =?ISO-2022-JP?B?RndkOiB0ZXN0IGZha2U=?=
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-type: text/plain; charset=iso-2022-jp
X-Priority: 3
Forwarded by <otusr111@ekisaito.ko.ni>
----------- Forwarded Message ------------
this is fake test from local
--------- End of Forwarded Message ---------
まあ なんか 送られました という事です
偽りを なすと どうなるか
# telnet 192.168.38.222 25 Trying 192.168.38.222... Connected to 192.168.38.222. Escape character is '^]'. 220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 10:49:29 +0900 helo smtp2001soho 250 local001.localserver200 Hello root@local001.localserver200 [192.168.38.222], pleased to meet you /* この送り手は まったく 関係の無い 送り手ですよ */ mail from:smtp2001soho@jippahoo.dog.land 250 2.1.0 smtp2001soho@jippahoo.dog.land... Sender ok /* うけては 変な人に送られないように 馴染の 人の協力を 得ましょう */ rcpt to:otusr111@ekisaito.ko.ni 250 2.1.5 otusr111@ekisaito.ko.ni... Recipient ok data 354 Enter mail, end with "." on a line by itself Subject: fake02 test koremo tukunoka? $3$l$b$D$/$N$+ . 250 2.0.0 k9S1nTXq000387 Message accepted for delivery quit 221 2.0.0 local001.localserver200 closing connection Connection closed by foreign host. /* とにかく送る事が 終わりました */ # cat messages Oct 28 10:49:29 local001 identd[389]: Connection from local001.localserver200 Oct 28 10:49:29 local001 identd[389]: from: 192.168.38.222 ( local001.localserver200 ) for: 32806, 25 Oct 28 10:51:57 local001 sendmail[387]: k9S1nTXq000387: from=smtp2001soho@jippahoo.dog.land, size=54, class=0, nrcpts=1, msgid=<200610280151.k9S1nTXq000387@local001.localserver200>, proto=SMTP, daemon=MTA, relay=root@local001.localserver200 [192.168.38.222] Oct 28 10:51:58 local001 sendmail[392]: k9S1nTXq000387: to=otusr111@ekisaito.ko.ni, delay=00:00:46, xdelay=00:00:01, mailer=esmtp, pri=30054, relay=mail.ekisaito.ko.ni. [333.444.555.666], dsn=2.0.0, stat=Sent (ok 1162000318 qp 6271)
なにか 不都合でも 要するに 送り手は 適当に 選ぶ 事が 出来ると いう事 です つまり 信用は出来ません と云う事ですね。 こんなことしていて よいの でせうか？
これも 同じ事を 試みます 外部 外部 偽り
# telnet 192.168.38.222 25 Trying 192.168.38.222... Connected to 192.168.38.222. Escape character is '^]'. 220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 11:04:58 +0900 helo superfake 250 local001.localserver200 Hello root@local001.localserver200 [192.168.38.222], pleased to meet you mail from:cell222@deferred.ne.ni 250 2.1.0 cell222@deferred.ne.ni... Sender ok rcpt to:otusr111@ekisaito.ko.ni 250 2.1.5 otusr111@ekisaito.ko.ni... Recipient ok data 354 Enter mail, end with "." on a line by itself Subject: fake test 003 send from local local001.localserver200 user user200 fake sender : cell222@deferred.ne.ni recitant : otusr111@ekisaito.ko.ni this is test. . 250 2.0.0 k9S24wIC000404 Message accepted for delivery quit 221 2.0.0 local001.localserver200 closing connection Connection closed by foreign host. # cat messages Oct 28 11:04:58 local001 identd[406]: Connection from local001.localserver200 Oct 28 11:04:58 local001 identd[406]: from: 192.168.38.222 ( local001.localserver200 ) for: 32813, 25 Oct 28 11:08:17 local001 sendmail[404]: k9S24wIC000404: from=cell222@deferred.ne.ni, size=145, class=0, nrcpts=1, msgid=<200610280206.k9S24wIC000404@local001.localserver200>, proto=SMTP, daemon=MTA, relay=root@local001.localserver200 [192.168.38.222] Oct 28 11:08:18 local001 sendmail[409]: k9S24wIC000404: to=otusr111@ekisaito.ko.ni, delay=00:01:48, xdelay=00:00:01, mailer=esmtp, pri=30145, relay=mail.ekisaito.ko.ni. [333.444.555.666], dsn=2.0.0, stat=Sent (ok 1162001298 qp 25638)
これでは どうなる
# cat local-host-names localserver200 jrijri.no-ip.info # telnet 192.168.38.199 25 Trying 192.168.38.199... Connected to 192.168.38.199. Escape character is '^]'. 220 jrijri.no-ip.info ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 11:27:02 +0900 helo superfakecricri 250 jrijri.no-ip.info Hello root@[192.168.38.199], pleased to meet you mail from:smtp2001soho@jippahoo.dog.land 250 2.1.0 smtp2001soho@jippahoo.dog.land... Sender ok rcpt to:otusr111@ekisaito.ko.ni 250 2.1.5 otusr111@ekisaito.ko.ni... Recipient ok data 354 Enter mail, end with "." on a line by itself Subject : Really Good luck . 250 2.0.0 k9S2R1T5000240 Message accepted for delivery quit 221 2.0.0 jrijri.no-ip.info closing connection Connection closed by foreign host. # cat messages Oct 28 11:27:01 jrijri identd[242]: Connection from 192.168.38.199 Oct 28 11:27:01 jrijri identd[242]: from: 192.168.38.199 ( 192.168.38.199 ) for: 1026, 25 Oct 28 11:28:53 jrijri sendmail[240]: k9S2R1T5000240: from=smtp2001soho@jippahoo.dog.land, size=28, class=0, nrcpts=1, msgid=<200610280228.k9S2R1T5000240@jrijri.no-ip.info>, proto=SMTP, daemon=MTA, relay=root@[192.168.38.199] Oct 28 11:28:53 jrijri sendmail[244]: k9S2R1T5000240: to=otusr111@ekisaito.ko.ni, delay=00:00:30, xdelay=00:00:00, mailer=esmtp, pri=30028, relay=mail.ekisaito.ko.ni. [333.444.555.666], dsn=2.0.0, stat=Sent (ok 1162002533 qp 36881)
今度は ????
# telnet 192.168.38.222 25 Trying 192.168.38.222... Connected to 192.168.38.222. Escape character is '^]'. 220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 11:30:48 +0900 helo fakfakefake 250 local001.localserver200 Hello root@[192.168.38.199], pleased to meet you mail from:smtp2001soho@jippahoo.dog.land 250 2.1.0 smtp2001soho@jippahoo.dog.land... Sender ok rcpt to:otusr111@ekisaito.ko.ni 250 2.1.5 otusr111@ekisaito.ko.ni... Recipient ok data 354 Enter mail, end with "." on a line by itself subject : ok? send from 192.168.38.199 user200 fake sender smtp2001soho@jippahoo.dog.land recitant otusr111@ekisaito.ko.ni control by 192.168.38.222 user user200 use sendmail as 192.168.38.199 . 250 2.0.0 k9S2UmE0000480 Message accepted for delivery quit 221 2.0.0 local001.localserver200 closing connection Connection closed by foreign host. on 192.168.38.199 # cat messages Oct 28 11:30:48 jrijri identd[252]: Connection from 192.168.38.222 Oct 28 11:30:48 jrijri identd[252]: from: 192.168.38.222 ( 192.168.38.222 ) for: 1029, 25 on 192.168.38.222 Oct 28 11:34:15 local001 sendmail[480]: k9S2UmE0000480: from=smtp2001soho@jippahoo.dog.land, size=165, class=0, nrcpts=1, msgid=<200610280232.k9S2UmE0000480@local001.localserver200>, proto=SMTP, daemon=MTA, relay=root@[192.168.38.199] Oct 28 11:34:16 local001 sendmail[483]: k9S2UmE0000480: to=otusr111@ekisaito.ko.ni, delay=00:01:31, xdelay=00:00:01, mailer=esmtp, pri=30165, relay=mail.ekisaito.ko.ni. [333.444.555.666], dsn=2.0.0, stat=Sent (ok 1162002856 qp 65798)
これでは 要するに 偽りの 送信者 でっちあげは かなり 簡単に 出来ると云 う事です 最後に これを 見ておきましょう くどいと 思いますが
# telnet 192.168.38.222 25 Trying 192.168.38.222... Connected to 192.168.38.222. Escape character is '^]'. 220 local001.localserver200 ESMTP Sendmail 8.12.11/8.12.11; Sat, 28 Oct 2006 11:49:56 +0900 helo funny 250 local001.localserver200 Hello root@[192.168.38.199], pleased to meet you mail from:smtp2001soho@jippahoo.dog.land 250 2.1.0 smtp2001soho@jippahoo.dog.land... Sender ok rcpt to:otusr111@ekisaito.ko.ni 250 2.1.5 otusr111@ekisaito.ko.ni... Recipient ok data 354 Enter mail, end with "." on a line by itself subject : funny send ok why you dont reject . 250 2.0.0 k9S2nuhl000503 Message accepted for delivery quit 221 2.0.0 local001.localserver200 closing connection Connection closed by foreign host. /* on 192.168.38.199 ここは telnet を 起動した 計算機の log です */ # cat messages Oct 28 11:49:56 jrijri identd[243]: Connection from 192.168.38.222 Oct 28 11:49:56 jrijri identd[243]: from: 192.168.38.222 ( 192.168.38.222 ) for: 1026, 25 /* on 192.168.38.222 telnet で 接続された sendmail が 動作した計算機です */ # cat messages Oct 28 11:51:26 local001 sendmail[503]: k9S2nuhl000503: from=smtp2001soho@jippahoo.dog.land, size=45, class=0, nrcpts=1, msgid=<200610280250.k9S2nuhl000503@local001.localserver200>, proto=SMTP, daemon=MTA, relay=root@[192.168.38.199] /* 要するに ここで relay= とある 計算機は telnet で 此処に 接続した 計算機 です */ Oct 28 11:51:27 local001 sendmail[506]: k9S2nuhl000503: to=otusr111@ekisaito.ko.ni, delay=00:00:42, xdelay=00:00:01, mailer=esmtp, pri=30045, relay=mail.ekisaito.ko.ni. [333.444.555.666], dsn=2.0.0, stat=Sent (ok 1162003887 qp 20674) /* ここでの relay= は 送信先の 計算機です */ /* 送信完了 しました では データーが どのように なるか 送ったものを */ /* 返信してもらって 内容を 見てみましょう */ /* on 192.168.38.133 返信してもらった というか 転送してもらった 計算機の */ /* ログ と 内容を 見て行きましょう まず 受信しました と云う事 */ # grep -v cell222 messages | grep sendmail Oct 28 11:57:24 nyanta sendmail[631]: k9S2vN3u000631: from=<otusr111@ekisaito.ko.ni>, size=1263, class=0, nrcpts=1, msgid=<20061028025718.4991.qmail@asp111.mail.ekisaito.ko.ni>, proto=SMTP, daemon=MTA, relay=mail.ekisaito.ko.ni [333.444.555.666] Oct 28 11:57:24 nyanta sendmail[632]: k9S2vN3u000631: to=<mailuser555@user100.server100.info>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=31470, dsn=2.0.0, stat=Sent /* 返信は 無事に ついた 様です では 内容は */ # cat /var/spool/mail/mailuser555 From otusr111@ekisaito.ko.ni Sat Oct 28 11:57:24 2006 Return-Path: <otusr111@ekisaito.ko.ni> Received: from mail.ekisaito.ko.ni (mail.ekisaito.ko.ni [333.444.555.666]) by user100.server100.info (8.13.4/8.13.4) with SMTP id k9S2vN3u000631 for <mailuser555@user100.server100.info>; Sat, 28 Oct 2006 11:57:24 +0900 Received: (qmail 4992 invoked by uid 65534); 28 Oct 2006 11:57:18 +0900 Date: 28 Oct 2006 11:57:18 +0900 Message-ID: <20061028025718.4991.qmail@asp111.mail.ekisaito.ko.ni> From: <otusr111@ekisaito.ko.ni> To: mailuser555@user100.server100.info Subject: =?ISO-2022-JP?B?RndkOiBmdW5ueQ==?= Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Content-type: text/plain; charset=iso-2022-jp X-Priority: 3 Forwarded by <otusr111@ekisaito.ko.ni> ----------- Forwarded Message ------------ send ok why you dont reject --------- End of Forwarded Message --------- /* 此処までは 良いと しませう 相手の 受信 内容の ヘッダー を 以下に 添付 */ /* して 返信したものです この部分から 始まります */ >From smtp2001soho@jippahoo.dog.land Sat Oct 28 02:51:27 2006 /* これは 偽りの 送り手です */ Return-Path: <smtp2001soho@jippahoo.dog.land> /* これは 偽りの 送り手です */ Delivered-To: otusr111@ekisaito.ko.ni Received: (qmail 20674 invoked from network); 28 Oct 2006 11:51:27 +0900 Received: from unknown (HELO local001.localserver200) ([999.999.999.999]) (envelope-sender <smtp2001soho@jippahoo.dog.land>) /* 当然 この様な ものは 無いので from unknown です */ /* [999.999.999.999] は 実際に そのとき 送信した IP アドレスが 入っています */ /* envelope-sender <smtp2001soho@jippahoo.dog.land> と お断りが 入っています */ /* 言い替えれば 接続する度に IP アドレスが 変わるとしたら？ */ by localhost.mail.ekisaito.ko.ni (qmail-1.03) with SMTP for <otusr111@ekisaito.ko.ni>; 28 Oct 2006 11:51:27 +0900 Received: from funny (root@[192.168.38.199]) /* プライベート アドレスが 出てきます ますます ？？？ */ by local001.localserver200 (8.12.11/8.12.11) with SMTP id k9S2nuhl000503 for otusr111@ekisaito.ko.ni; Sat, 28 Oct 2006 11:50:45 +0900 Date: Sat, 28 Oct 2006 11:49:56 +0900 From: smtp2001soho@jippahoo.dog.land Message-Id: <200610280250.k9S2nuhl000503@local001.localserver200> subject: funny
ほなら あるメールアドレスを 何処からか 入手する メール アドレス fakea@bad.sender もう一つ 送り先の メー ルアドレスを 調べる misery@miserable.cow そうして 何処かの ネットワーク に いれて頂いて 接続する 毎に IP アドレスが 変わるのが 条件として 望まし い の 様な 環境から メールを 送る事が 出来るようです。
こういうものなのか？
にゃんたろう 拝！
2006年10月28日 (土) 23:54:10 JST 作成