SPAM $B$N8=>u$HBP:v(B ($BAp9F(B)

JANOG Special Session In Interop 98 Tokyo

• $B$O$8$a$K(B
  
  $B$3$3(B JANOG $B$K=8$&G;!A$$J}!9$K$$$^$5$i(B SPAM $B$N35MW$r@bL@$9$k$^$G$b$J$$$H;W$C$F$$$k$G$9$,!"$G$-$l$P35MW$b$=$7$F%a%$%k$@$1$G$O$J$/(B Usenet $B$K$*$1$k$3$H$bOC$7$FM_$7$$$H$$$&$3$H$G$7$?$N$G$3$NJU$j$K$b$A$g$C$H?($l$k$h$&$K$7$?$$$H9M$($F$*$j$^$9!#$?$@;~4V$N@)Ls>e$+$J$jC<@^$i$6$k$rF@$:@bL@B-$i$:$JE@$b@8$8$F$/$k$G$7$g$&$,(B URL $B$r<($7$F$*$-$^$9$N$G>\:Y$K4X$7$^$7$F$O$=$A$i$r;2>H$7$F2<$5$$$^$;!#$J$*(B JANOG 2 $B$K$F(B Usenet $B4XO"$N1iBj$,$"$k$H$N$3$H$@$=$&$G$9!#(B
  $B$J$*$3$N869F$O2q>lE~CeA0?t;~4V$/$i$$$G=q$->e$2$?$b$N$G$"$j$[$H$s$IFI$_JV$7$F$$$J$$$N$G!"FbMF$K$*$+$7$JE@$d8m;z$J$I$,$"$k$+$b$7$l$^$;$s!#(Bhttp://www.ayamura.org/interop98/ $B$K2CI.!"=$@5$7$?$b$N$rITDj4|$KCV$$$F$*$-$^$9!#(B
  
  $B$^$?(B SPAM $BLdBj$O3F%5%$%H$N%]%j%7!<$H$bL)@\$K4XO"$7$F$/$k$b$N$G$"$j!"5;=QE*$J
  
• SPAM $B$H$O(B
  
  SPAM $B$H$$$&8l<+BN$r<*$K$9$k!"L\$K$9$k$3$H$b>/$J$/$J$$$H;W$o$l$k$N$G$9$,!"(BSPAM $B$N8l8;$O?)IJ$NL>A0$G(B Hormel Foods Corporation $B&I8$H$7$FEPO?$7$F$$$^$9!#6=L#K\0L$G4L5M$r9XF~$5$l$?J}$b$$$i$C$7$c$k$N$G$O$J$$$+$H!#$G(B SPAM $B$H$OJ?$?$/8@$&$J$l$P0lJ}E*$KAw$jIU$1$i$l$F$/$k!"$^$?(B Usenet $B$GL5:9JL$K%/%m%9%]%9%H!"%^%k%A%]%9%H$5$l$F$$$k%(%m%5%$%H$N@kEA!"J*IJHNGd$J$I$rL\E*$H$7$?%8%c%s%/5-;v$H$$$C$?$b$N$G$9!#$J$*:G6a$G$OEE;R%a%$%k$G$N(B SPAM $B$O(B Unsolicited Bulk Email (UBE), Unsolicited Commercial Email (UCE) $B$J$I$HI=5-$9$k$3$H$,>/$J$/$J$$$h$&$G$9$,!"$3$3$G$O$3$H$o$i$J$$8B$j0lHL$K9-$/CN$i$l$F$$$k$H;W$o$l$k(B SPAM $B$H$$$&8l$GE}0l$5$;$F$$$?$@$-$^$9!#(B
  
  http://spam.ayamura.org/whatisspam.html
  http://www.cauce.org/
  http://www.imc.org/ube-def.html
  http://caramia.g-net.org/spam/
  
  $B0l8@(B SPAM $B$H8@$$$^$7$F$bEE;R%a%$%k%Y!<%9!"(BUsenet $B%Y!<%9$N$b$N$J$I$KBgJL$G$-$^$9!#$3$3$G$OEE;R%a%$%k%Y!<%9$K=EE@$rCV$$$FOC$5$;$F$$$?$@$-$^$9!#(B
  
  
• $BEE;R%a%$%k$G$N(B SPAM $B$H$=$NLdBjE@(B
  
  $BEE;R%a%$%k$K$h$k(B SPAM $B$K$O%@%$%l%/%H%a%$%k(B (DM) $B6H]$H$J$k$N$G(B ML $B$r4IM}$5$l$F$$$k>l9g$K$O0B0W$K9XFI $B$3$&$7$?%M%C%H%o!<%/$K$*$1$k(B DM $B$OM9@/>J%a%$%k$K$h$k$b$N$H$O0[$J$j!"%b%G%`$H(B PC $B$/$i$$$,$"$l$PC/$G$b$[$H$s$I$?$@EvA3$N%3%9%H$G9T$($k$N$G!"Bg$-$JLdBj$H$J$j$D$D$"$k8=:_$G$b8:$k$3$H$J$/$`$7$m3N
  $B0J2<$K(B SPAM $B$NLdBjE@$r$$$/$D$+$+$$$D$^$G$s5s$2$F$_$^$9!#(B
  
  (a) $BAw$jIU$1$k%a%$%k$N?t$O?tK|!"?t==K|DL$K$b5Z$V$N$G2s@~!"%5!<%P!<$N%j%=!<%9$r?)$$DY$7$^$9!#$5$i$K$OBg5,LO$J(B ISP $B$G$O8\5R?t$,B?$$$N$G $B$3$l$O(B Third-Party Mail Relay ($BF'Bf(B) $B$K$b4XO"$7$F$/$kE@$J$N$G8e$G$b$&>/$7?<$/7!$j2<$2$F$$$-$^$9!#(B
  
  (b) $BH/?.85$,(B ISP $B$N8\5R$+$i$@$C$?$j$9$k$H$=$N(B ISP $B$X6l>p$,;&E~$9$k$3$H$,$"$j!"$=$l$KBP1~$9$k$?$a$K$OB?$/$N?ME*;q8;$,I,MW$K$J$j$^$9!#H/?.85$,%X%C%@$J$I$r56B$$7$F(B ISP $B$N%f!<%6!<$dBh;0l9g$K$O;vBV$O$5$i$KJ#;($K$J$j!"o$K0- $B%X%C%@Fb$N(B From: $B$rqY$i$l$?>l9g$b$5$k$3$H$J$,$i(B envelope $BFb$N(B MAIL FROM: (Return Path: $B$d(B UNIX From $B$H$7$F:G=*E*$K$O%f!<%6!<$,L\$K$9$k$b$N(B) $B$,<+%I%a%$%s$N$b$N$rqY$i$l$?$j$9$k$HBgNL$N%(%i!<%a%$%k$K8+Iq$o$l$k$3$H$K$J$j$^$9!#(B
  $B$3$NJU$j$K4X$7$^$7$F$b8e$G>/$7?($l$^$9!#(B
  
  (c) $B@-JL!"G/Np!"?&CHq$9$k$3$H$K$J$j$^$9!#FC$K:G6a$G$OEE;R%a%$%k$G$N$d$jeNI$/$J$$$H$$$&B&LL$b8+F($;$^$;$s!#(B
  $BBP:v$K$"$?$C$F$N8D?M%l%Y%k!"(BISP $B%l%Y%k$G$N%U%#%k%?%j%s%0$NR2p$7$^$9!#(B
  
  (d) $B$^$?(B MMF (Make Money Fast), Get Rich Quick $B$J$I$H>N$5$l$k%M%:%_9V!"%^%k%A9V$NN`$$$,;5$-;6$i$5$l$k$3$H$b$"$j!"$3$l$O%A%'!<%s%a%$%k$K7R$,$k2DG=@-$b$"$j$^$9!#$3$l$i$O(B Ponzi Scheme $B$H$b>N$9$k$3$H$b$"$j!"$3$l$O9qFbK!$G$O$I$N$h$&$K07$o$l$k$+>\:Y$OCN$j$^$;$s$,!"8=;~E@$G$O??$C9u$HCG$8$k$3$H$O$G$-$J$$;vNc$,B?$$$+$b$7$l$^$;$s!#K!N'E*$JB&LL$K4X$7$F$O$3$N>l$G7kO@$,=P$;$k@-
  (e) $B$^$?(B SPAM $B$H$O8@$o$J$$$N$+$b$7$l$^$;$s$,EE;R%a%$%k$r0-MQ$7$?$b$N$H$7$FFCDj8D?M$X$N%a%$%kGzCF(B (mail bomb) $B$J$I$b$"$j$^$9!#$3$l$O%&%'%V$G$N7G<(HD$J$I$GFCDj8D?M$X$N967b$r@p$k$h$&$JFbMF$,=q$+$l$?$j$9$k$3$H$K5/0x$9$k$3$H$,B?$$$h$&$G$9!#(B
  
  http://spam.ayamura.org/spambad.html
  http://www.cauce.org/problem.html
  
  
• Third-Party Mail Relay ($BF'Bf(B) $B$H$=$NLdBjE@(B
  
  $B@h$[$I2s@~!"%5!<%P!<$N%j%=!<%9$r?)$$DY$91>!9$H$$$&$3$H$r8@$$$^$7$?$,!"?tK|!"?t==K|$K$b5Z$V%a%$%k$r$P$i$^$/?M$Njn$GAjKP$r$H$kE*$KB>=j$N%a%$%k%[%9%H$r2p$7$F$=$3$+$i(B explode ($BGzH/(B) $B$5$;$k$b$N$,BeI=E*$G$9!#(B

   (SENDER) -------+         +------> (RECIPIENT)
                   |         |
              +----+---------+----+ 
              |    |         |    |
              |    V         |    |
              |  +-------------+  |
              |  | MAIL SERVER |  |
              |  +-------------+  |
              |                   |
              |   (LOCAL USER)    |
              +-------------------+
  

  $B>e$N?^$rNc$K$7$F@bL@$9$k$H(B SENDER $B$H$$$&30It$NH/?.85$,(B (SENDER $B$K$H$C$F$O(B) $BBh;0QMQP protocol $B$G%j%l!<$G$-$l$P0lDL$G:Q$`$N$G$O$J$I$H$$$&$A$c$A$c$O$3$3$G$O5Q2<$$$?$7$^$9(B :)
  
  $B0J2<$KF'Bf$NLdBjE@$r$$$/$D$+$+$$$D$^$G$s5s$2$F$_$^$9!#(B
  
  (a) $B%a%$%k%[%9%H$J$I$N7W;;5!;q8;$r?)$$DY$7$^$9!#e>:$7$^$9!#$=$l$KH<$$(B sendmail $B$J$I$O%3%M%/%7%g%s$r
  (b) $BB?$/$Np$N%a%$%k$,2!$74s$;$k$3$H$,$"$j$^$9!#$=$l$KH<$$BP1~$9$k$?$a$N%5%]!<%HMW0w$J$I?ME*;q8;$r$bEjF~$;$6$k$rF@$J$/$J$k$+$b$7$l$^$;$s!#$3$l$ONA6b$N>e>:$J$I$r>7$-:G=*E*$K$O%f!<%6!<$,B;32$rHo$k$3$H$K$J$j$+$M$^$;$s!#(B
  
  (c) $B%$%s%?!<%M%C%H%3%_%e%K%F%#!@\$OL\$K8+$($:?tCM2=$9$k$3$HFq$7$$$G$9$,Hs>o$KBg$-$JIi$H$J$k$G$7$g$&!#(B
  
  (d) $B%&%'%V%Z%$%8>e$J$I$K$"$k%V%i%C%/%j%9%H$K5s$2$l$?$j!"$=$NAH?%$+$i$N%a%$%k$r5qH]$9$k$h$&$J%5%$%H$,B?$/@8$8$F$/$k$+$b$7$l$^$;$s!#C/$,0lHVB;32$rHo$k$+$H8@$($P%f!<%6!<$G$"$j!"A1NI$J%f!<%6!<$,=P$7$?%a%$%k$9$iMPS RBL $B$N%V%i%C%/%j%9%H$K%j%9%H%"%C%W$5$l$F$$$?$j$7$^$7$?!#8=:_$G$bNc$($P(B geocities.co.jp $B$J$I$,%j%l!<$7J|Bj$J:$$C$?@_Dj$K$J$C$F$$$k$h$&$G$9!#(B
  
  CERT* Summary CS-97.06 $B$N(B 4. Relaying of Spam Email through Victim Sites $B$G$b$3$&$7$?F'BfBP:v$r$H$k$3$H$r4+9p$7$F$$$^$9!#(B
  
  ftp://ftp.cert.org/pub/cert_summaries/CS-97.06
  http://maps.vix.com/tsi/
  http://www.imc.org/ube-relay.html
  
  
• Third-Party Mail Relay ($BF'Bf(B) $BBP:v$N
  SPAM $B$*$h$SF'BfBP:v$OAj8_$K4XO"$7$^$9$,!"$^$:$OF'BfBP:v$K$"$?$C$F$NBgOH$r>e5-$N?^$rMQ$$$F<($7$^$9$H(B
  $B!&(BLOCAL USER $B$D$^$j<+%M%C%H%o!<%/Fb$N%/%i%$%"%s%H$+$i$N%a%$%k$O$I$3$X$G$b%j%l!<$7$F$"$2$k(B
  $B!&(BSENDER $B$D$^$j30It$N%/%i%$%"%s%H$+$i$N%a%$%k$O(B LOCAL USERS $B08$7$+ $B$H$J$j$^$9!#(B
  
  $B:G$bB?$/;HMQ$5$l$F$$$k(B MTA $B$G$"$k(B sendmail $B$G$O(B 8.8.x (8.8.x $B$N:G=*HG$O(B 8.8.8) $B$GF3F~$5$l$?(B check_relay $B%k!<%A%s$rMxMQ$9$k$3$H$K$J$j$^$9!#$$$^$@$K(B 8.6.x $B$d(B 8.7.x $B$r;HMQ$7$F$$$k%5%$%H$O%Q%U%)!<%^%s%9!"%;%-%e%j%F%#$J$I$N4QE@$+$i$b(B 8.8.8 $B$b$7$/$O(B 8.9.0 $B$X(B$B%P!<%8%g%s%"%C%W(B$B$7$FM_$7$$$b$N$G$9!#(B
  
  $B8=;~E@$G$O(B V8/Berkeley $B%U%)!<%^%C%H$K$OBP1~$7$F$$$^$;$s$,9qFb$G$O(B CF-3.6W $B$,9-$/;HMQ$5$l$F$$$^$9!#(BCF-3.6W $B$G:n@.$7$?(B sendmail-8.8.x $BMQ$N(B sendmail.cf $B$r(B 8.9.0 $B$G$b$H$j$"$($:N.MQ$9$k$3$H$O$G$-$^$9(B (Warning $B$,=P$k$+$b$7$l$^$;$s$,$H$j$"$($:5$$K$7$J$$$GJ?5$$G$9(B)$B!#(B
  
  CF_TYPE=R8V7
  MAIL_RELAY_RESTRICTION=yes
  REJECT_SOURCE_ROUTE_RELAY=yes
  
  LOCAL_HOST_IPADDR=/etc/mail/sendmail.localip
  192.168.1
  192.168.2.123
  $B<+%[%9%H$r%j%l!<%[%9%H$H$7$FMxMQ$7$F$bNI$$%[%9%H$N(B IP $B%"%I%l%9(B/$B%M%C%H%o!<%/$rNs5-$9$k!#0lHLE*$K$O<+%5%$%HFb$N(B IP $B%"%I%l%9$rNs5-$7$F$*$/$3$H$K$J$j$^$9!#$J$*(B 192.168.1 $B$H$7$?>l9g$O(B 192.168.1.0/24 $BA4$F$r0UL#$7$^$9!#(B
  
  LOCAL_HOST_DOMAIN=/etc/mail/sendmail.localdomain
  innerdomain.name
  $B$3$l$O(B LOCAL_HOST_IPADDR $B$HF1MM$J$b$N$G$"$j<+%[%9%H$r%j%l!<%[%9%H$H$7$FMxMQ$7$F$bNI$$(B DNS $B$K$*$1$k%[%9%H!"%I%a%$%s%M!<%`$rNs5-$7$^$9!#$b$A$m$s5U0z$-$G$-$J$$%[%9%H$O4^$^$l$^$;$s!#$J$*(B innerdomain.name $B$H$7$?>l9g$O(B *.innerdomain.name $B$r$b4^$`$3$H$KCm0U$7$F2<$5$$!#(B
  
  LOCAL_HOST_IPADDR, LOCAL_HOST_DOMAIN $B$H$b$KJ;MQ$9$k$3$H$,$G$-$^$9$7!"$I$A$i$+0lJ}$@$1!"$^$?$ON>J}$H$bL$@_Dj$G$b9=$$$^$;$s$,(B LOCAL_HOST_IPADDR $B$r@_Dj$7$F$*$$$?J}$,2?$+$HJXMx$G$7$g$&!#(B
  
  RELAY_MAP=hash $B$^$?$O(B ndbm
  Berkeley DB package (DB-1.8[56]) $B$J$j$r;HMQ$9$k$h$&$K$7$^$9!#(Bhash $B$^$?$O(B ndbm $B$K$7$F(B map lookup $B$5$;$F$*$1$PJQ99$7$F$b(B sendmail $B$r:F5/F0$9$k$3$H$,$J$$$N$G(B RELAY_MAP=null $B$h$j$OJXMx$G$9!#(B
  
  RELAY_MAP=/etc/mail/sendmail.relay.map
  $B0J2<$N(B somedomain.name $B$J$I$O(B DNS $B>e$N$b$N$G$O$J$/!"$"$/$^$G$b%X%C%@$G$O$J$/(B envelope $BFb$N(B {sender,recipient} address $B$G$N%I%a%$%s%Q!<%H$G$"$k$3$H$KCm0U$7$F2<$5$$!#(B
  # user@somedomain.name, user@*.somedomain.name $B$+$i$O08@h$K(B
  # $B4X78$J$/$I$3$X$G$b%j%l!<$7$F$"$2$k(B ($BCm0U(B 1)
  # $B$?$@$7(B LOCAL_HOST_IPADDR, LOCAL_HOST_DOMAIN $B$r@_Dj$7$F$"$k(B
  # $B>l9g$K$O$3$N@_Dj$OM-8z$K$O$J$i$J$$(B
  #
  # somedomain.name!. allow
  # .somedomain.name!. allow
  
  # $B$?$@$7(B user@deny.somedomain.name $B$+$i$N%a!<%k$O%j%l!<$5$;$J$$(B
  #
  deny.somedomain.name!. deny
  
  # user@somedomain.name, user@*.somedomain.name $B$+$i$G$b(B
  # user@remailer.name $B$X$O%j%l!<$5$;$J$$(B
  
  somedomain.name!.remailer.name deny
  .somedomain.name!.remailer.name deny
  
  # somedomain.name, *.somedomain.name $B08$r # $B%j%l!<$7$F$"$2$k!"Nc$($P(B secondary $B0J2<$N(B MX $B$rC4$C$F$$$k(B
  # $B>l9g$J$I(B ($BCm0U(B 2)
  # $B$?$@$7(B CHECK_HOST_DENY $B$K4^$^$l$F$$$k%[%9%H$+$i$O08@h$K(B
  # $B4X78$J$/ #
  .!somedomain.name allow
  .!.somedomain.name allow
  
  ($BCm0U(B 1)
  RELAY_MAP $B$G$N(B somedomain.name $B$J$I$O(B DNS $B>e$N$b$N$G$b%X%C%@Fb$N$b$N$G$b$J$/(B envelope $BFb$N(B {sender,recipient} address $B$G$9$N$G!"qY$i$l$?>l9g$K$OITK\0U$KF'Bf$K$5$l$F$7$^$&2DG=@-$,$"$j$^$9!#$f$($K%]%j%7!<$K$b0M$j$^$9$,(B LOCAL_HOST_IPADDR $B$J$I$G%j%l!<$r5v2D$9$k(B IP address $B$J$I$rM=$aL@<(E*$K;XDj$7$F$*$$$?J}$,L5Fq$G$7$g$&!#>e5-$N@_Dj$rNc$K$9$k$H(B
  # somedomain.name!. allow
  # .somedomain.name!. allow
  $B$,M-8z$K$J$C$F$$$k$H30It$+$i$G$b(B MAIL FROM: $B$rqY$k$3$H$K$h$C$FC/$b$,F'Bf$H$7$FMxMQ$G$-$k$3$H$K$J$j!"$3$l$O%P%C%/%I%"E*$J@_Dj$H$b8@$((B sendmail-8.9.0 $B$G$N(B FEATURE(relay_local_from) $B$HF1MM$J7j6u$19T0Y$H$J$k$N$G$"$^$j$*A&$a$G$-$^$;$s!#(Bfj.mail, fj.net.providers $B$G$bOCBj$K$J$C$F$$$^$7$?$,$$$/$D$+$N(B ISP $B$G$O$3$N$h$&$J@_Dj$K$J$C$F$$$k$h$&$G$9!#(B
  
  ($BCm0U(B 2)
  $BEv3:%[%9%H$,JL%[%9%H$N(B secondary $B0J2<$N(B MX $B$rC4$C$F$$$k>l9g$K$O!"$=$NJL%[%9%H08$N$b$N$r$b%j%l!<$7$F$"$2$k$h$&$K@_Dj$7$F$*$+$J$$$H!"JL%[%9%H$,Mn$A$F$$$k4V$J$I$K0l;~E*$KG[Aw$5$l$F$-$?JL%[%9%H08$X$N%a!<%k$rA4$F(B reject $B$7$F$7$^$$$^$9!#$BF0:n%A%'%C%/(B$B$r9T$o$J$$$^$^1?MQ$7$F$7$^$&Nc$b>/$J$/$J$$$h$&$G$9!#$3$&$J$k$H(B Postmaster $B08$X$N%a%$%k$9$il9g$K$OEEOC$J$I$NFEATURE(relay_based_on_MX) $B$rMQ$$$F$3$l$r2sHr$G$-$k$h$&$K$J$C$F$$$^$9$,@5$7$/@_Dj$7$F$*$1$P$"$i$?$a$F@_Dj$9$kI,MW$O$J$$$G$7$g$&!#(B
  
  $Bsendmail-8.9.0 $B$G$"$j$^$9$,$3$l$O(B SPAM, RELAY $BBP:v$X$N6/$$MW@A$rMh$H$O0[$J$j%G%U%)%k%H$G$OF'Bf$K$5$l$J$$$h$&$KJQ99$5$l$F$*$j!"(BSPAM $BBP:v$K4X$7$F$b:#$^$G(B 8.8.x $BMQ$K3F=j$G8x3+$5$l$F$-$?3Fcf/README $B$,;29M$K$J$j$^$9!#(B
  
  define(`confCR_FILE', `/etc/mail/relay-domains')
  192.168.1
  192.168.2.123
  innerdomain.name
  $B<+%[%9%H$r%j%l!<%[%9%H$H$7$FMxMQ$9$k$3$H$,$G$-$k(B DNS $B>e$G$N%I%a%$%s%M!<%`$b$7$/$O(B IP $B%"%I%l%9$rNs5-$7$^$9!#5U0z$-$G$-$J$$%[%9%H$N>l9g$O(B IP $B%"%I%l%9$G;XDj$7$^$9!#(B192.168.1 $B$H$7$?>l9g$O(B 192.168.1/24 $B$r0UL#$7$^$9!#(BFEATURE(relay_hosts_only) $B$r@_Dj$7$F$$$J$$>l9g$O(B *.innerdomain.name $B$r$b4^$_!"$3$3$G$N@_DjFbMF$,(B class 'R' ($=R) $B$H$J$j$^$9!#(B
  
  FEATURE(access_db, hash -o /etc/mail/access)
  192.168.1 RELAY
  192.168.2.123 RELAY
  somedomain.name RELAY
  $B1&JU(B (RHS) $B$K$O(B "OK", "RELAY", "REJECT", "DISCARD", "### any text" (### $B$O(B RFC 821 compliant error code) $B$r@_Dj$G$-!"(B"RELAY" $B$H$7$?>l9g$O:8JU(B (LHS) $B$K$"$k(B DNS $B>e$G$N%I%a%$%s%M!<%`$b$7$/$O(B IP $B%"%I%l%9$N%[%9%H$O<+%[%9%H$r%j%l!<%[%9%H$H$7$FMxMQ$9$k$3$H$,$G$-$k$H$H$b$K!"<+%[%9%H$r2p$7$?$=$N%[%9%H08$X$N%a%$%k$r5v2D$7$^$9!#(BFEATURE(relay_hosts_only) $B$r@_Dj$7$F$$$J$$>l9g$O(B *.somedomain.name $B$r$b$_$^$9!#$J$*(B makemap $B$rMQ$$$k$HJQ99$,$9$0$KM-8z$K$J$j(B sendmail $B$=$N$b$N$K(B SIGHUP $B$rAw$k$J$I$7$F:F5/F0$9$kI,MW$,$"$j$^$;$s!#(B
  
  $B$5$i$K$$$/$D$+$N%*%W%7%g%J%k$J@_Dj$,$"$j$^$9!#(B
  
  FEATURE(promiscuous_relay)
  $B$I$3$+$i$I$3$X$G$b%a%$%k$r%j%l!<$9$k$h$&$K$7$^$9!#$3$l$OF'Bf9T0Y$r5vMF$7$F$7$^$&7k2L$K$J$k$N$G;HMQ$7$J$$$h$&$K$9$k$Y$-$G$9!#(B
  
  FEATURE(relay_local_from)
  envelope sender address $B$G$N%I%a%$%s%Q!<%H$,(B class 'w' ($=w) ($BDL>o$O(B /etc/mail/sendmail.cw) $B$J$I$N%m!<%+%k$HG'<1$9$k$b$N$H40A40lCW$7$?>l9g$I$3$X$G$b%a%$%k$r%j%l!<$7$^$9!#(Benvelope sender address $B$OMF0W$K:>>N$G$-$k$b$N$J$N$G$3$N@_Dj$OBg$-$JH4$1F;$r:n$C$F$7$^$&$3$H$K$J$j$*A&$a$G$-$^$;$s!#(B POP $B$G$NG'>Z$rMxMQ$7$?%j%l!<5v2D$J$I$H$$$C$?J}K!$r:N$k$J$I$7$?J}$,NI$$$G$7$g$&!#(B
  
  FEATURE(relay_based_on_MX)
  DNS $B$r:w$$$F(B RCPT TO: $B$K$"$k08@h$N(B MX $B%l%3!<%I$K<+%[%9%H$,4^$^$l$F$$$k$+$rD4$Y!"4^$^$l$F$$$k>l9g$K8B$j$=$N08@h$X%j%l!<$9$k$h$&$K$9$k!#$?$@$74X78$N$J$$%I%a%$%s$,(B DNS $B$N(B MX $B%l%3!<%I$K<+%[%9%H$r>!
  FEATURE(relay_entire_domain)
  access db $B$N(B RHS $B$,(B "RELAY" $B$K$J$C$F$$$k$b$N$@$1$G$O$J$/!"(Bclass 'm' ($=m) $B$GDj5A$5$l$F$$$k%I%a%$%s(B ($BDL>o$O<+%I%a%$%sL>(B) $B$KB0$9$k%[%9%H$O<+%[%9%H$r%j%l!<%[%9%H$H$7$FMxMQ$9$k$3$H$,$G$-$k$H$H$b$K!"<+%[%9%H$r2p$7$?$=$N%I%a%$%s08$X$N%a%$%k$r5v2D$7$^$9!#Nc$($P(B Dm mydomain.name $B$HDj5A$5$l$F$$$k>l9g(B mydomain.name $B$*$h$S(B *.mydomain.name $B$+$i$N%a%$%k$r%j%l!<$9$k$H$H$b$K!"(Bmydomain.name $B$*$h$S(B *.mydomain.name $B08$N%a%$%k$r$b%j%l!<$7$F$"$2$^$9!#(B
  
  FEATURE(relay_hosts_only)
  $BDL>o(B access db $B$N(B RHS $B$,(B "RELAY" $B$K$J$C$F$$$k$b$N$*$h$S(B class 'R' ($=R) $B$GDj5A$5$l$F$$$k%I%a%$%s$O!"$=$l$@$1$G$O$J$/$=$l$h$j$b2<0L$N%I%a%$%s$bM-8z$K$J$C$F$$$^$9!#$3$N(B FEATURE(relay_hosts_only) $B$r@_Dj$7$?>l9g$O2<0L$N%I%a%$%s$OM-8z$K$O$J$j$^$;$s!#>e5-$NNc$G8@$&$H(B *.innerdomain.name $B$,4^$^$l$J$$$h$&$K$J$j$^$9!#(B
  
  FEATURE(loose_relay_check)
  source routing $BI=5-$N%a%$%k%"%I%l%9$KBP$9$k%A%'%C%/$r4E$/$9$k!#>\:Y$O(B http://www.informatik.uni-kiel.de/%7Eca/email/norelay.html $B$J$I$r;2>H$7$F2<$5$$!#(B
  
  $B:G6a$O$h$j0BA4$+$D9bB.$@$H8@$o$l$F$$$k(B qmail $B$r;HMQ$9$k%5%$%H$bA}$($F$-$F$$$k$h$&$G$9$,F'BfBP:v$r$?$F$k$N$OHs>o$K4JC1$G$9!#(B
  
  RCPT TO: $B$K8=$l$F$h$$08@h(B ($B$"$k08@h$N2<0L$N(B MX $B$rC4$C$F$$$k>l9g$O$=$N08@h$b$*K:$l$J$/(B) $B$r(B control/rcpthosts $B$KNs5-$7$F$*$1$P!"$=$NB>$N08@h$X$N%a%$%k$r%j%l!<$7$J$$$h$&$K$J$j$^$9!#(Bcontrol/rcpthosts $B$,B8:_$7$J$$>l9g$K$O$I$3$X$G$b%j%l!<$7$F$7$^$&$N$G@_Dj$9$k$h$&$K$7$^$9!#$?$@$74D6-JQ?t(B RELAYCLIENT $B$,%;%C%H$5$l$F$$$k$H$-$K$O(B qmail-smtpd $B$O(B control/rcpthosts $B$,B8:_$7$J$$$b$N$H$7$F$9$Y$F$N%a%$%k$r
  $B$"$kFCDj$N%/%i%$%"%s%H$+$i$N%a%$%k$K8B$j(B control/rcpthosts $B$G$N@_Dj$K4X78$J$/$I$3$X$G$b%j%l!<$7$F$"$2$k$h$&$K@_Dj$9$k$K$O$$$/$D$+$NJ}K!$,$"$j$^$9$,!"$b$C$H$bJXMx$J$b$N$H$7$F$O(B ucspi-tcp $B$r(B$BJ;MQ$9$kJ}K!(B$B$G$9!# 127.0.0.1:allow,RELAYCLIENT=""
  friend@192.168.2.123-126:allow,RELAYCLIENT=""
  192.168.1.:allow,RELAYCLIENT=""
  $B$J$I$H@_Dj$7$?%m!<%+%k%[%9%H$NB>$K(B 192.168.2.12[3-6] $B>e$N(B friend $B$H$$$&%f!<%6!<(B ($B$?$@$7(B IDENT/TAP $B$K$h$C$F%j%b!<%H%[%9%H$+$i4D6-JQ?t(B TCPREMOTEINFO $B$rl9g$N$_M-8z(B) $B$H(B 192.168.2.12[3-6] $B$+$i$N%a%$%k$r(B control/rcpthosts $B$G$N@_Dj$K4X78$J$/$I$3$X$G$b%j%l!<$7$F$"$2$k$h$&$K$J$j$^$9!#(Bsendmail $B$G$N(B makemap $B$HF1MM$K@_Dj$rJQ99$7$?>l9g(B tcprules $B%3%^%s%I$rMQ$$$l$P%W%m%;%9$=$N$b$N$r:F5/F0$9$k$3$H$J$/D>A0$^$G$NJQ99$,M-8z$K$J$j$^$9!#(B
  
  qmail $B$G$NF|K\8l$K$h$k>pJs$OEl5~9)6HBg3X$NA0LnG/5*@h@8$,4IM}$5$l$F$$$k(B
  http://www.jp.qmail.org/
  $B$K$^$H$a$i$l$F$*$j(B qmail $B$K6=L#$,$J$$J}$G$bHs>o$K;29M$K$J$k%j%=!<%9$G$9!#(B
  
  $B$=$NB>(B exim $B$d(B Windows $B4D6-$G$N@_Dj$J$I$K4X$7$^$7$F$O0J2<$N(B URL $B$J$I$r;2>H$7$F2<$5$$$^$;!#$J$*B>$NJ}$+$i$NEAJ9$G$9$,(B Windows NT + IMS $B$H$$$&%5%$%H$,7k9=$"$k$h$&$J$N$G$9$,(B IMS $B$O3+H/$,=*N;$7$F$$$k$i$7$/!"$7$+$b$=$N$^$^$G$OF'Bf$K$5$l$F$7$^$&$i$7$$$N$G$9$,(B http://www1.sica.com/ims/ $B$+$iF'BfKI;_$N$?$a$N%W%i%0%$%s$J$I$rF~\:Y$OL$3NG'$G$9!#(B
  
  
• SPAM $BBP:v$N
  $B$3$l$O3F%5%$%H$N%]%j%7!<$J$I$K$b4X$o$C$F$/$k$H$3$m$G$"$j$^$9$,!"R2p$7$F$_$^$9!#(B
  
  WIDE CF-3.6W $B$G$O>e5-$NF'BfBP:v$K2C$($F(B
  
  SPAM_LIST=/etc/mail/sendmail.junklist
  SPAM_LIST_TYPE=hash/ndbm/null ($B%G%U%)%k%H$O(B null)
  CHECK_HOST_DENY=/etc/mail/sendmail.deny
  USE_SENDER_DNS_CHECK=yes/no ($B%G%U%)%k%H$O(B no)
  
  $B$J$I$H$$$C$?@_Dj$rMQ$$$^$9!#(B
  
  SPAM_LIST $B$K$O(B
  spammer@junk.domain SPAMMER
  10.111.222.222 JUNKIP
  192.168.111 JUNKNETWORK
  # $B0J2<$N>l9g(B *.junk.domain $B$b4^$`(B
  junk.domain JUNKDOMAIN
  $B$H$$$&$h$&$K(B envelope sender address, envelope sender address $B$N%I%a%$%s%Q!<%H!"(BSMTP $B@\B3$7$F$/$k%I%a%$%s!"%[%9%H!"(BIP address $B$r:8JU$KNs5-$G$-$^$9!#=EJ#$7$J$$$+$.$j$$$/$D$G$b@_Dj$G$-!"(BDB $B%U%)!<%^%C%H$N7A<0>e1&JU$K$O<+J,$G7h$a$?E,Ev$JC18l$r=q$$$F$*$-$^$9!#(BSPAM_LIST_TYPE=hash/ndbm $B$G$"$l$PJQ99$7$F$b(B sendmail $B$r:F5/F0$5$;$?$j$9$kI,MW$,$J$$$N$G%G!<%?%Y!<%94IM}$b3Z$G$9!#(B
  $B$^$?(B USE_SENDER_DNS_CHECK=yes $B$H$7$?>l9g$O(B envelope sender address $B$N%I%a%$%s%Q!<%H$,(B DNS $BE*$K(B resolve $B$G$-$J$$$b$N$r(B 4xx $B$J(B SMTP reply codes $B$rJV$9$h$&$K$J$C$F$$$Fl9g2?EY$b@\B3$r7+$jJV$7$F$/$k$3$H$,$"$k$N$G(B 5xx $B$rJV$9$h$&$KJQ99$9$k$J$j$b$7$/$O;HMQ$7$J$$$h$&$K$7$?J}$,NI$$$+$b$7$l$^$;$s!#(B
  
  sendmail-8.9.0 $B$G$O(B access_db $B$H$$$&$b$N$,(B SPAM$B!"F'BfBP:v$N?4B!It$G$"$j(B
  EATURE(access_db, hash -o /etc/mail/access)
  FEATURE(blacklist_recipients)
  $B$J$I$H@_Dj$7$F$*$/$H(B access_db $B$K$O(B

  spammer@aol.com		REJECT
  206.117.147		REJECT
  cyberspammer.com	550 We don't accept mail from spammers
  okay.cyberspammer.com	OK
  sendmail.org		OK
  128.32			RELAY
  badlocaluser		550 Mailbox disabled for this username
  host.mydomain.com	550 That host does not accept mail
  user@otherhost.mydomain.com	550 Mailbox disabled for this recipient
  

  $B$H$$$&$h$&$K(B SPAM, $BF'BfBP:v$rE}9g$7$F4IM}$9$k$3$H$,$G$-$^$9!#$5$i$K(B RCPT TO: $B$r$bI>2A$7$FE,Ev$J(B SMTP reply codes $B$rH<$C$?%a%C%;!<%8$rJV$7$F OK accept mail even if other rules in the running ruleset would reject it. RELAY Allow domain to relay through your SMTP server. RELAY also serves an implicit OK for the other checks. REJECT reject the sender/recipient with a general purpose message. DISCARD discard the message completely using the $#discard mailer ### any text where ### is an RFC 821 compliant error code and "any text" is a message to return for the command. qmail $B$G$O(B qmail-smtpd $B$+$i;2>H$5$l$F$$$k(B control/badmailfrom $B$K$O(B
  spammer@aol.com
  cyberspammer.com
  $B$J$I$H(B envelope sender address , envelope senders $B$N%I%a%$%s%Q!<%H$rNs5-$7$F$*$/$3$H$,$G$-$^$9!#$5$i$K(B qmail-1.02 $B$+$i$O(B control/databytes $B$Ge8B$r@_Dj$G$-$k$h$&$K$J$C$F$$$^$9!#>e$G$b5s$2$?(B ucspi-tcp $B$rMQ$$$l$P(B /etc/tcp.smtp $B$G(B
  206.117.147.:deny
  $B$J$I$H@_Dj$7$F$*$1$P>e5-$N(B class C block $B$+$i$N(B SMTP $B@\B3$=$N$b$N$r5qH]$9$k$3$H$,$G$-$^$9!#(B
  
  
• $B$*$^$1(B (MAPS RBL)
  
  $B$"$H8fB8CN$NJ}$bB?$$$+$H;W$o$l$^$9$,(B MAPS (the Mail Abuse Protection System) RBL (Realtime Blackhole List) $B$r(B DNS $B7PM3$G;HMQ$9$k$H$$$&J}K!$b$"$j$^$9!#$3$l$O(B SMTP $B@\B3$7$F$/$k%[%9%H$,$3$N%V%i%C%/%j%9%H$K:\$C$F$$$k$+H]$+$r(B DNS $B7PM3$GLd$$9g$o$;!":\$C$F$$$k>l9g$K$O?MG$$;$JB&LL$b$"$j$^$9$,<+A0$G%G!<%?%Y!<%94IM}$r$9$kqmail, exim, smail, smtpd, smap $B$J$I$+$i$b4JC1$K(B$BMxMQ(B$B$G$-(B
  WIDE CF ($B$?$@$7(B CF-3.6W $B$G$O$*$+$7$JE@$,$"$k$h$&$J$N$G;HMQ$7$J$$J}$,NI$$$+$b(B) $B$G$O(B USE_MAPS_RBL=yes
  cf $B$G$O(B FEATURE(rbl)
  $B$H@_Dj$7(B ucspi-tcp $B$G$O(B ucspi-tcp-0.80-rbl.diffs $B$H$$$&%Q%C%A$r$"$F$F$*$/$@$1$G$9!#(B
  $B$J$*(B tcp_wrappers-7.6 $B$r(B MAPS RBL $BBP1~$K$9$k(B$B%Q%C%A(B$B$b$"$j$^$9!#(B
  
  
• $BBP:v$K$"$?$C$F$NLdBjE@!"%]%j%7!
  $B5;=QE*$K$O$3$N$h$&$K$=$l$J$j$NBP:v$r$H$k$3$H$,$G$-$^$9$,?'!9$JLdBjE@$r$b$O$i$s$G$$$^$9!#(B
  
  $BFC$K(B SPAM $BBP:v$K4X$7$F$O$"$kFCDj$N%I%a%$%s!"%a%$%k%"%I%l%9$J$I$+$i$N%a%$%k$r0lN'$K5qH]$7$F$7$^$&$H!"0lIt$N%f!<%6!p$r8@$o$l$k$3$H$,$"$k$G$7$g$&!#(Bprocmail $B$d(B rblcheck $B$J$I$H$$$C$?%D!<%k$rMQ$$$F%f!<%6!<$,3F<+$N%]%j%7!<$G%U%#%k%?$G$-$k$h$&$J%7%9%F%`9=C[$r$9$k$H$$$&$N$b0l$D$Ncheck_local $B$G$N(B _SPAM_FRIENDS_, _SPAM_HATERS_ $B$rMQ$$$k$H$$$&$N$b$*A&$a$G$9!#$$$E$l$K$;$h3F%5%$%H$N%]%j%7!<r7o$J$I$K$b0M$k$N$G$3$l$H$$$C$?4p=`$O$"$j$^$;$s!#(B
  
  $B$^$?<+%M%C%H%o!<%/Fb$+$i$N%a%$%k$K4X$7$F$O@)8B$r$+$1$F$$$J$$>l9g$,$[$H$s$I$G$7$g$&$,!"FbIt$N%f!<%6!<$+$i(B SPAM $B$,$P$i$^$+$l$?>l9g!"B?$/$N6l>p$J$I$,2!$74s$;$F$/$k$3$H$bEvA3$"$j$^$9!#6l>p$KBP$7$F$I$N$h$&$KBP=h$7$F$$$/$N$+!"$^$?3:Ev%f!<%6!<$rFM$-;_$a$k$3$H$,$G$-$?>l9g$I$N$h$&$JBP1~$r$H$k$N$+$J$I$H$$$C$?%,%$%I%i%$%s$r7h$a$F$*$/I,MW$,$"$j$^$9!#(B
  $B$H$3$m$G$3$&$7$?(B net-abuse $B$J9T0Y$K4X$9$k6l>p$r RFC2142 Mailbox Names for Common Services, Roles and Functions. D.Crocker.
  May 1997. (Format: TXT=12195 bytes) (Status: PROPOSED STANDARD)
  $B$G$O(B

  MAILBOX        AREA                USAGE
  -----------    ----------------    ---------------------------
  ABUSE          Customer Relations  Inappropriate public behaviour
  

  $B$H$$$&$h$&$K6l>p$NBP1~Ak8}$H$7$F(B abuse@ $B$H$$$&%a%$%k%"%I%l%9$rMQ0U$9$k$3$H$,Ds>'$5$l$F$*$j!"ISP $B$,B?$$$h$&$G$9!#9qFb$G$O6K0lIt$N(B ISP $B$G$7$+B8:_$7$J$$$h$&$G$"$jBgB??t$G$OMQ0U$5$l$F$$$J$$$h$&$G$9!#(B
  $BA4$F$N6l>p$KBP1~$9$k$3$H$O$G$-$J$$$G$7$g$&$,6Z$,DL$C$?6l>p$KBP$7$F$O$A$c$s$HBP1~$9$k$h$&$K$9$kI,MW$,$"$k$+$H;W$$$^$9$7!"BP1~2A$r$9$k$3$H$,$G$-$k$N$G$O$J$$$+$H$b;W$$$^$9!#?M$N%a%$%k%"%I%l%9$rqY$C$?5-;v$r$P$i$^$/GZ$,$$$k$N$G2?$H$+$7$F$/$lE*$J6l>p$J$I$r=P$7$F$b$J$7$N$D$V$F$GA4$/2;:;BA$J$7$H$$$&Nc$K$O;v7g$-$^$;$s!#$G$-$l$PAk8}$rMQ0U$7$FBP1~$G$-$k$h$&$JBN@)$r@0$($F$*$$$FM_$7$$$b$N$G$9!#(B
  
  $B$"$HF'BfBP:v$r;\$7$?>l9g!"JL$N(B ISP $B$K%@%$%"%k%"%C%W(B PPP $B@\B3$7$F$$$?$j$9$k$H$-$K(B POP $B7PM3$G%a!<%k$rl9g$K$=$N%I%a%$%s08$G$O$J$$%a!<%k$,5qH]$5$l$F$7$^$&$3$H$K$J$j$^$9!#$=$N$?$a%a!<%k$rAw?.$9$k>l9g$K$O(B Eudora $B$J$I%f!<%6!l9g$K$O$=$NETEY(B MUA $B$G$N@_Dj$rJQ99$9$k$Y$-$J$N$G$9$,!"%f!<%6!Z$rMQ$$$FF0E*$K%j%l!<5v2D$r9T$&$H$$$&$b$N$,$"$j$^$9!#$I$N$h$&$J$b$N$+$H8@$$$^$9$H30It$+$i$N%"%/%;%9$G$"$C$F$b(B POP $B$GG'>Z$,:Q$s$@%/%i%$%"%s%H$+$i$N%a%$%k$O$I$3$X$G$b%j%l!<$7$F$"$2$k$H$$$&$b$N$G$9!#(BPOP $B$GG'>Z:Q$_$N%f!<%6!<$,%"%/%;%9$7$F$-$F$$$k(B IP address $B$rFbIt%"%I%l%9$H$7$FDj5A$5$l$F$$$k%G!<%?%Y!<%9$K2C$($F$d$k$N$G$9!#DI2C$7$?$^$^$@$H4m81$J$N$G$"$k0lDj;~4V8e$O$=$N(B(! ! ! ! B(! ! ! B $BIP(B $Baddres(Bs $B$r%G!<%?%Y!<%9$+$i:o=|$9$k$h$&$K$7$^$9!#
  http://spam.ayamura.org/tools/smPbS.html
  http://www.iecc.com/pop-before-smtp.html
  http://www.tech-net.net/technical/unix/popauth.html
  http://www.informatik.uni-kiel.de/%7Eca/email/chk-rcpt5.html
  ftp://ftp.navya.com/pub/sendmail-spam-v2.tar.gz
  http://www.qmail.org/open-smtp.tar.gz
  
  
• $B$^$H$a(B
  
  $B!&A40h$KEO$C$FF'BfBP:v$r;\$7$F$*$/!#(B
  $B!&(BSPAM $B$O%4%_F1A3$N$b$N$G$"$j7W;;5!!"%M%C%H%o!<%/;q8;$rO2Hq$9$k!#(B
  $B!&(BSPAM $B$r $B!&(BMailing List $B$N9XFI $B!&(BSPAM $BBP:v$K$"$?$C$F$I$N$h$&$J%U%#%k%?$r$+$1$k$N$+!"FbIt$+$i$N(B SPAM $B$KBP$7$F$I$N$h$&$KBP=h$9$k$N$+$J$I%,%$%I%i%$%s$rM=$a7h$a$F$*$/!#(B
  $B!&:.Mp$r>7$+$J$$$h$&$K%f!<%6!<$X$N;vA0%"%J%&%s%9$J$I$rE0Dl$7$F$*$/!#(B
  $B!&(Bnet-abuse $B$J9T0Y$KBP$9$k6l>p$N
  $B$7$+$7$J$,$i(B
  $B!&%f!<%6!<%5%$%I$G$N650i$b4^$a$F(B Email $B$H$$$&$b$N$,9qFb$G$O$^$@ $B!&(BSPAM $B1>!90JA0$NLdBj$H$7$F$A$c$s$H4IM}$G$-$k?M:`$,>/$J$9$.$k(B
  $B$H$$$&0U8+$b>/$J$/$J$$$h$&$G$9!#;d<+?H$,$A$c$s$H$7$F$$$k$o$1$G$O$J$$$N$GBg$-$J$3$H$r8@$($J$$$N$G$9$,!"%W%m%0%i%_%s%0E*G=NO$H4IM}G=NO$H$$$&$b$N$O0[$J$k/$J$/$"$j$^$;$s!#$G$-$k4IM}
  $BOC$,0o$l$F$7$^$$$^$7$?$,(B SPAM $B9T0Y$K$h$k@kEA9-9p8z2L$O$[$H$s$I$J$/!"$`$7$mAw$j2A$rM?$($k$@$1$G$"$k$H$$$&$3$H$,

  ---

  Ayamura Kikuchi <ayamura@ayamura.org>