5. sendmail.cf

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1 5. sendmail.cf

2 Contents sendmail.cf NULL Client PPP Client Firewall

3 sendmail.cf sendmail ( ) ( ) SMTP UUCP

4 sendmail.cf OS sendmail sendmail.cf MX Lower MX MX RR

5 sendmail.cf V1: sendmail 5 ( V1) V2, V3: sendmail 6.x V4: sendmail 8.5 V5: sendmail 8.6.x V6: sendmail 8.7.x V7: sendmail 8.8.x mqueue sendmail qf sendmail

6 sendmail.cf cf? sendmail R8 SunOS ($%y ) Null address (<>,? list:;? list:;@host %-hack?

7 sendmail.cf OS m4 cf sendmail mailconf JUNET CF sendmail R8

8 CF sendmail.cf make cleantools; make tools sed perl sendmail.def Standards/* make sendmail.cf sendmail.def sendmail.cf sendmail.cf

9 .def MX CF_TYPE=R8V7 sendmail.8.8 V7 OS_TYPE=bsdos3.0 OS mailer BITNET=mx

10 ACCEPT_ADDRS='x.co.jp' (!) FROM_ADDRESS='x.co.jp' root, daemon, postmaster,... ACCEPT_ADDRS='sub1.co.jp sub2.x.co.jp'

11 NULL Client CF_TYPE=R8V7-null SPOOL_HOST=mail.x.co.jp [] (lower MX A RR ) IP

12 PPP FROM_ADDRESS=po.provider.ne.jp DIRECT_DELIVER_DOMAINS=none DEFAULT_RELAY=mail.provider.ne.jp CON_EXP=True SMTP_MAILER_FLAG_ADD=e mqueue sendmail -q

13 PPP userdb, usertable check_compat O DialDelay=15s POP

14 Firewall (0/3) NS NS NS Wildcard MX * IN MX 10 ext-mail.x.co.jp. NS Wildcard MX

15 Firewall (1/3) 1 a. zone NS split-brain DNS b.

16 1 a b Internet Internet NS split-brain DNS ( zone) NS

17 Firewall (2/3) 2 DNS DNS a b

18 2 a NS NS Internet b Internet NS NS

19 DIRECT_DELIVER_DOMAINS=x.co.jp DEFAULT_RELAY=external.x.co.jp

20 STATIC_ROUTE_FILE=x.static x.static: GW [ ] # (internal.x.co.jp) DOM x.co.jp

21 Firewall (3.1/3) 1 a. first MX inner-host IN MX 10 inner-host IN MX 20 gw 1st-MX b. A RR inner-host IN A IN MX 10 gw

22 Firewall (3.2/3) c. inner.domain.jp inner.domain.jp.local sendmail.cf STATIC_ROUTE_FILE MAP (CF) d. 1 IP named named sendmail sendmail O DaemonPortOptions=Address=

23 NS 1 (cont.) a, b bind8 allow-query a 1st MX 2nd MX

24 NS 1 (cont d) b A RR 1st-MX TRY_NULL_MX_LIST=True (CF) O TryNullMXList=True (sendmail.cf) local configuration error

25 GW DIRECT_DELIVER_DOMAINS=none DEFAULT_RELAY=internal.x.co.jp DIRECT_DELIVER_DOMAINS=x.co.jp DEFAULT_RELAY=internal.x.co.jp NULL Client

26 (cont.) 1st-MX 2nd-MX 2nd-MX aliases ACCEPT_ADDRS= SECONDARY_*= 1st-MX

27 (cont d) aliases NIS aliases aliases OA/etc/aliases, nis: mail.aliases ML

28 (cont.) 1 USERTABLE_MAPS='domain1=hash:/etc/map1 domain2=hash:/etc/map2' (1) 1 IP sendmail O DaemonPortOptions=Address= chroot

29 (cont d) (2) sendmail.cf local mailer /etc/passwd POP

30 sendmail.cf sendmail -bv sendmail -bt /etc/sendmail.cf

31 sendmail -bv mqueue (permission) % sendmail -C new.cf -oq/tmp -bv user@domain motonori@wide.ad.jp... deliverable: mailer smtp, host wide.ad.jp., user motonori@wide.ad.jp

32 3,0 /parse 5 smtp mailer 3,0 /parse local mailer ( ) /try ( )

33 ( ) 0 5 (/parse) (mailer) (local ) 3 2 R= (/try) 4 1 S=

34 (1) sendmail -bt % sendmail -C new.cf -bt > 3,0 motonori@wide.ad.jp rewrite: ruleset 3 input: wide. ad. Jp : rewrite: ruleset 0 returns: $# smtp $@ wide. ad. jp. $: motonori wide. ad. jp > R5 sendmail 0 address R8 sendmail 3,0 address ( /parse)

35 (2) % sendmail -C new.cf -bt > 3,0 motonori@wide.ad.jp rewrite: ruleset 3 input: wide. ad. Jp : rewrite: ruleset 0 returns: $# local $: motonori >

36 (3) 5 5 sendmail R8 3,0 local mailer aliases > 5 motonori rewrite: ruleset 5 input: motonori rewrite: ruleset 5 returns: $# smtp $@ spool $: motonori spool >

37 (4) > /tryflags HS > /try smtp motonori Trying header sender address motonori for mailer smtp rewrite: ruleset 3 input: motonori : rewrite: ruleset 4 returns: wide. ad. jp Rcode = 0, addr = motonori@wide.ad.jp

38 % sendmail -C new.cf -oq/tmp -v From: To: This is a test. % -oq/tmp

39 SMTP # sendmail -C new.cf -bs 220 mail.wide.ad.jp ESMTP Sendmail MAIL FROM:<motonori> 250 <motonori>... Sender ok RCPT TO:<motonori> 250 <motonori>... Recipient ok DATA 354 Enter mail, end with "." on a line by itself test. 250 TAA13313 Message accepted for delivery QUIT 221 mail.wide.ad.jp closing connection

40 sendmail.cf (cont.) /etc/sendmail.cf ( ) daemon sendmail # ps aux grep sendmail 72??... accepting connections on port 25 (sendmail) 195??... sendmail: OAA12345 mail.y.co.jp.: user open # kill -HUP 72 SIGHUP R8 sendmail R5 sendmail

41 sendmail.cf cf (cont d) # /usr/lib/sendmail -bd -q1h -bd ( ) -q1h (1 ) -q30m (30) mqueue # /usr/lib/sendmail -q1h

42 Sendmail.cf (MX)

MUA (Mail User Agent) MTA (Mail Transfer Agent) DNS (Domain Name System) DNS MUA MTA MTA MUA MB mailbox MB

MUA (Mail User Agent) MTA (Mail Transfer Agent) DNS (Domain Name System) DNS MUA MTA MTA MUA MB mailbox MB »» SMTP MAIL FROM: 250 sender ok RCPT TO: 250 recipient