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+-7.272 -1.584 RL 1.584 -3.24 RL CL BL 396 279.6 MT -7.272 -1.584 RL
+1.584 -3.24 RL CL ST(Figure 1 \212 Sendmail System Structure.)208 346.8
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+(ry or queueing for netw).15 F .281(ork transmission)-.1 F/F3 7
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+F .042(ving and)-.25 F 1.195(in sending mail.)102 549.2 R 1.194
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+(nd the message body is sent on the standard input.)-2.941 F(An)117
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+-.15 F(y)-.15 E 2.621(problems. The)117 637.4 R -.15(ex)2.621 G .121(it status from the mailer is collected after the message is sent, and a diagnostic)
+.15 F(is printed if appropriate.)117 649.4 Q .32 LW 76 678.8 72 678.8 DL
+80 678.8 76 678.8 DL 84 678.8 80 678.8 DL 88 678.8 84 678.8 DL 92 678.8
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+8/Times-Roman@0 SF -.12(ex)3.2 K(cept when mailing to a \214le, when).12
+E/F6 8/Times-Italic@0 SF(sendmail)2 E F5(does the deli)2 E -.12(ve)-.2 G
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+(2.2.2. SMTP)102 96 R -.1(ove)2.5 G 2.5(rp).1 G(ipes)-2.5 E/F1 10
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+(The SMTP protocol [Postel82] can be used to run an interacti)142 112.2
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+(ut no recipient addresses are passed to the mailer via)-.2 F .075
+(the ar)117 136.2 R .075(gument list.)-.18 F .075(Instead, the)5.075 F
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+(re passed one at a time in commands sent to the processes stan-)-2.575
+F .19(dard input.)117 148.2 R(An)5.19 E .19(ything appearing on the standard output must be a reply code in a special format.)
+-.15 F F0 2.5(2.2.3. SMTP)102 172.2 R -.1(ove)2.5 G 2.5(ra).1 G 2.5(nI)
+-2.5 G(PC connection)-2.5 E F1 .366
+(This technique is similar to the pre)142 188.4 R .366
+(vious technique, e)-.25 F .366(xcept that it uses a 4.2bsd IPC chan-)
+-.15 F .953(nel [UNIX83].)117 200.4 R .953(This method is e)5.953 F .953
+(xceptionally \215e)-.15 F .952
+(xible in that the mailer need not reside on the)-.15 F(same machine.)
+117 212.4 Q(It is normally used to connect to a sendmail process on another machine.)
+5 E F0 2.5(2.3. Operational)87 236.4 R(Description)2.5 E F1 .228
+(When a sender w)127 252.6 R .228
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+(istinct phases.)-3.528 F 1.028(In the \214rst phase, it collects)6.028
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+(ry occurs.).15 F .612(If there were errors during)5.612 F 1.59
+(processing during the second phase,)102 288.6 R F2(sendmail)4.09 E F1
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+(essage describing the)-4.09 F
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+(ubprocess techniques, the ar)-3.322 F .822(guments are \214rst)-.18 F
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+(Recipient addresses are then collected, either)5.796 F .717(from the command line or from the SMTP RCPT command, and a list of recipients is created.)
+117 364.8 R .347(Aliases are e)117 376.8 R .347
+(xpanded at this step, including mailing lists.)-.15 F .347(As much v)
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+-.15(ve)-.25 G(ry).15 E 5.708(.F)-.65 G(orw)-5.858 E .708
+(arding is also performed)-.1 F(as the local addresses are v)117 412.8 Q
+(eri\214ed.)-.15 E F2(Sendmail)142 429 Q F1 .307
+(appends each address to the recipient list after parsing.)2.807 F .307
+(When a name is aliased)5.307 F .322(or forw)117 441 R .322(arded, the old name is retained in the list, and a \215ag is set that tells the deli)
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+117 453 R .479(This list is k)5.479 F .479
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+(nting alias loops and duplicate).15 F(messages deli)117 465 Q -.15(ve)
+-.25 G(rd to the same recipient, as might occur if a person is in tw).15
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+2.5 E F2(Sendmail)142 505.2 Q F1 .454(then collects the message.)2.954 F
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+(eader at the be).15 F(ginning.)-.15 E .778
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+-3.278 F(xt)-.15 E .78(\(i.e., binary data is not allo)117 529.2 R 3.28
+(wed\). The)-.25 F .779(header is parsed and stored in memory)3.28 F
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+142 609.6 S 2.618(re).15 G .117
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+(Each mailer in)117 621.6 R -.2(vo)-.4 G .619
+(cation sends to all users recei).2 F .619
+(ving the message on one host.)-.25 F .62(Mailers that only)5.62 F
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+E .47
+(The message is sent to the mailer using one of the same three interf)
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+117 661.8 R 1.465(Each cop)6.465 F 3.965(yo)-.1 G 3.965(ft)-3.965 G
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+(mission. The)117 176.4 R .632(letter can be mailed back or written in the \214le \231dead.letter\232 in the sender')
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+/Times-Roman@0 SF(2)-4 I F1(.)4 I F0 2.5(2.4. Message)87 214.4 R
+(Header Editing)2.5 E F1 1.756
+(Certain editing of the message header occurs automatically)127 230.6 R
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+(under control of the con\214guration \214le.)102 242.6 R .41
+(Some lines can be mer)5.41 F .41(ged; for e)-.18 F .41
+(xample, a \231From:\232 line and)-.15 F 2.5<6199>102 254.6 S
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+-.18 E F0 2.5(2.5. Con\214guration)87 278.6 R(File)2.5 E F1 .798(Almost all con\214guration information is read at runtime from an ASCII \214le, encoding macro)
+127 294.8 R .679(de\214nitions \(de\214ning the v)102 306.8 R .678(alue of macros used internally\), header declarations \(telling sendmail the)
+-.25 F 1.009(format of header lines that it will process specially)102
+318.8 R 3.509(,i)-.65 G 1.009
+(.e., lines that it will add or reformat\), mailer)-3.509 F .478
+(de\214nitions \(gi)102 330.8 R .478(ving information such as the location and characteristics of each mailer\), and address)
+-.25 F(re)102 342.8 Q .428
+(writing rules \(a limited production system to re)-.25 F .429
+(write addresses which is used to parse and re)-.25 F(write)-.25 E
+(the addresses\).)102 354.8 Q 2.828 -.8(To i)127 371 T(mpro).8 E 1.528
+-.15(ve p)-.15 H 1.228(erformance when reading the con\214guration \214le, a memory image can be pro-)
+.15 F 2.5(vided. This)102 383 R(pro)2.5 E
+(vides a \231compiled\232 form of the con\214guration \214le.)-.15 E F0
+2.5(3. USA)72 407 R(GE AND IMPLEMENT)-.55 E -.95(AT)-.9 G(ION).95 E 2.5
+(3.1. Ar)87 431 R(guments)-.1 E F1(Ar)127 447.2 Q .376
+(guments may be \215ags and addresses.)-.18 F .377(Flags set v)5.377 F
+.377(arious processing options.)-.25 F -.15(Fo)5.377 G(llo).15 E .377
+(wing \215ag)-.25 F(ar)102 459.2 Q .281(guments, address ar)-.18 F .281
+(guments may be gi)-.18 F -.15(ve)-.25 G .281
+(n, unless we are running in SMTP mode.).15 F .28(Addresses fol-)5.28 F
+(lo)102 471.2 Q 2.5(wt)-.25 G(he syntax in RFC822 [Crock)-2.5 E
+(er82] for ARP)-.1 E(ANET address formats.)-.92 E
+(In brief, the format is:)5 E 12.5(\(1\) An)107 487.4 R
+(ything in parentheses is thro)-.15 E(wn a)-.25 E -.1(wa)-.15 G 2.5(y\()
+.1 G(as a comment\).)-2.5 E 12.5(\(2\) An)107 503.6 R .051
+(ything in angle brack)-.15 F .051(ets \(\231<)-.1 F .051
+(>\232\) is preferred o)1.666 F -.15(ve)-.15 G 2.551(ra).15 G -.15(ny)
+-2.551 G .051(thing else.).15 F .051(This rule implements the)5.051 F
+(ARP)133.66 515.6 Q(ANET standard that addresses of the form)-.92 E
+(user name <machine-address>)173.66 531.8 Q(will send to the electronic \231machine-address\232 rather than the human \231user name.)
+133.66 548 Q<9a>-.7 E 12.5(\(3\) Double)107 564.2 R 2.246(quotes \()
+4.746 F -2.754 2.5("\) q)2.5 H 2.246
+(uote phrases; backslashes quote characters.)-2.5 F 2.246
+(Backslashes are more)7.246 F(po)133.66 576.2 Q .654(werful in that the)
+-.25 F 3.154(yw)-.15 G .655(ill cause otherwise equi)-3.154 F -.25(va)
+-.25 G .655(lent phrases to compare dif).25 F .655(ferently \212 for)
+-.25 F -.15(ex)133.66 588.2 S(ample,).15 E F2(user)2.5 E F1(and)2.5 E F2
+("user")2.5 E F1(are equi)2.5 E -.25(va)-.25 G(lent, b).25 E(ut)-.2 E F2
+(\\user)2.5 E F1(is dif)2.5 E(ferent from either of them.)-.25 E -.15
+(Pa)127 604.4 S 1.12(rentheses, angle brack).15 F 1.12
+(ets, and double quotes must be properly balanced and nested.)-.1 F(The)
+6.12 E(re)102 618.4 Q(writing rules control remaining parsing)-.25 E F3
+(3)-4 I F1(.)4 I .32 LW 76 646 72 646 DL 80 646 76 646 DL 84 646 80 646
+DL 88 646 84 646 DL 92 646 88 646 DL 96 646 92 646 DL 100 646 96 646 DL
+104 646 100 646 DL 108 646 104 646 DL 112 646 108 646 DL 116 646 112 646
+DL 120 646 116 646 DL 124 646 120 646 DL 128 646 124 646 DL 132 646 128
+646 DL 136 646 132 646 DL 140 646 136 646 DL 144 646 140 646 DL 148 646
+144 646 DL 152 646 148 646 DL 156 646 152 646 DL 160 646 156 646 DL 164
+646 160 646 DL 168 646 164 646 DL 172 646 168 646 DL 176 646 172 646 DL
+180 646 176 646 DL 184 646 180 646 DL 188 646 184 646 DL 192 646 188 646
+DL 196 646 192 646 DL 200 646 196 646 DL 204 646 200 646 DL 208 646 204
+646 DL 212 646 208 646 DL 216 646 212 646 DL/F4 5/Times-Roman@0 SF(2)
+93.6 656.4 Q/F5 8/Times-Roman@0 SF(Ob)3.2 I(viously)-.12 E 2.226(,i)-.52
+G 2.226(ft)-2.226 G .226(he site gi)-2.226 F .226(ving the error is not the originating site, the only reasonable option is to mail back to the sender)
+-.2 F 4.227(.A)-.44 G(lso,)-4.227 E .191(there are man)72 669.2 R 2.191
+(ym)-.12 G .19(ore error disposition options, b)-2.191 F .19(ut the)-.16
+F 2.19(yo)-.12 G .19(nly ef)-2.19 F .19(fect the error message \212 the \231return to sender\232 function is al)
+-.2 F -.08(wa)-.08 G .19(ys han-).08 F(dled in one of these tw)72 678.8
+Q 2(ow)-.08 G(ays.)-2.08 E F4(3)93.6 689.2 Q F5
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+(3.2. Mail)87 96 R(to Files and Pr)2.5 E(ograms)-.18 E/F1 10
+/Times-Roman@0 SF .609(Files and programs are le)127 112.2 R .609
+(gitimate message recipients.)-.15 F .609(Files pro)5.609 F .609
+(vide archi)-.15 F -.25(va)-.25 G 3.109(ls).25 G .61(torage of mes-)
+-3.109 F .124(sages, useful for project administration and history)102
+124.2 R 5.124(.P)-.65 G .124(rograms are useful as recipients in a v)
+-5.124 F .124(ariety of)-.25 F .69(situations, for e)102 136.2 R .691(xample, to maintain a public repository of systems messages \(such as the Berk)
+-.15 F(ele)-.1 E(y)-.15 E/F2 10/Times-Italic@0 SF(msgs)102 148.2 Q F1
+(program, or the MARS system [Sattle)2.5 E(y78]\).)-.15 E(An)127 164.4 Q
+3.188(ya)-.15 G .688(ddress passing through the initial parsing algorithm as a local address \(i.e, not appear)
+-3.188 F(-)-.2 E .276(ing to be a v)102 176.4 R .276
+(alid address for another mailer\) is scanned for tw)-.25 F 2.776(os)-.1
+G .277(pecial cases.)-2.776 F .277(If pre\214x)5.277 F .277(ed by a v)
+-.15 F(erti-)-.15 E .18(cal bar \(\231)102 188.4 R .833<7c9a>.833 G 2.68
+(\)t)-.833 G .179
+(he rest of the address is processed as a shell command.)-2.68 F .179
+(If the user name be)5.179 F .179(gins with a)-.15 F(slash mark \(\231/)
+102 200.4 Q
+(\232\) the name is used as a \214le name, instead of a login name.).833
+E .241(Files that ha)127 216.6 R .541 -.15(ve s)-.2 H .241
+(etuid or setgid bits set b).15 F .241(ut no e)-.2 F -.15(xe)-.15 G .241
+(cute bits set ha).15 F .541 -.15(ve t)-.2 H .241(hose bits honored if)
+.15 F F2(send-)2.742 E(mail)102 228.6 Q F1(is running as root.)2.5 E F0
+2.5(3.3. Aliasing,)87 252.6 R -.25(Fo)2.5 G(rwarding, Inclusion).25 E F2
+(Sendmail)127 268.8 Q F1 1.075(reroutes mail three w)3.575 F 3.575
+(ays. Aliasing)-.1 F 1.074(applies system wide.)3.575 F -.15(Fo)6.074 G
+(rw).15 E 1.074(arding allo)-.1 F 1.074(ws each)-.25 F .233
+(user to reroute incoming mail destined for that account.)102 280.8 R
+.233(Inclusion directs)5.233 F F2(sendmail)2.733 E F1 .233
+(to read a \214le for)2.733 F 2.5(al)102 292.8 S
+(ist of addresses, and is normally used in conjunction with aliasing.)
+-2.5 E F0 2.5(3.3.1. Aliasing)102 316.8 R F1 1.554
+(Aliasing maps names to address lists using a system-wide \214le.)142
+333 R 1.553(This \214le is inde)6.553 F -.15(xe)-.15 G 4.053(dt).15 G(o)
+-4.053 E 1.1(speed access.)117 345 R 1.101
+(Only names that parse as local are allo)6.1 F 1.101
+(wed as aliases; this guarantees a unique)-.25 F -.1(ke)117 357 S 2.5
+(y\()-.05 G(since there are no nicknames for the local host\).)-2.5 E F0
+2.5(3.3.2. F)102 381 R(orwarding)-.25 E F1 .651
+(After aliasing, recipients that are local and v)142 397.2 R .651
+(alid are check)-.25 F .65(ed for the e)-.1 F .65
+(xistence of a \231.for)-.15 F(-)-.2 E -.1(wa)117 409.2 S .493
+(rd\232 \214le in their home directory).1 F 5.493(.I)-.65 G 2.994(fi)
+-5.493 G 2.994(te)-2.994 G .494(xists, the message is)-3.144 F F2(not)
+2.994 E F1 .494(sent to that user)2.994 F 2.994(,b)-.4 G .494
+(ut rather to)-3.194 F .37(the list of users in that \214le.)117 421.2 R
+.37
+(Often this list will contain only one address, and the feature will be)
+5.37 F(used for netw)117 433.2 Q(ork mail forw)-.1 E(arding.)-.1 E -.15
+(Fo)142 449.4 S(rw).15 E 1.151
+(arding also permits a user to specify a pri)-.1 F -.25(va)-.25 G 1.152
+(te incoming mailer).25 F 6.152(.F)-.55 G 1.152(or e)-6.302 F 1.152
+(xample, for)-.15 F(-)-.2 E -.1(wa)117 461.4 S(rding to:).1 E -2.5 .833
+("| /)157 477.6 T(usr/local/ne)-.833 E(wmail myname")-.25 E
+(will use a dif)117 493.8 Q(ferent incoming mailer)-.25 E(.)-.55 E F0
+2.5(3.3.3. Inclusion)102 517.8 R F1
+(Inclusion is speci\214ed in RFC 733 [Crock)142 534 Q(er77a] syntax:)-.1
+E(:Include: pathname)157 550.2 Q .391
+(An address of this form reads the \214le speci\214ed by)117 566.4 R F2
+(pathname)2.891 E F1 .391(and sends to all users listed in that)2.891 F
+(\214le.)117 578.4 Q .644(The intent is)142 594.6 R F2(not)3.144 E F1
+.644(to support direct use of this feature, b)3.144 F .644
+(ut rather to use this as a subset of)-.2 F 2.5(aliasing. F)117 606.6 R
+(or e)-.15 E(xample, an alias of the form:)-.15 E
+(project: :include:/usr/project/userlist)157 622.8 Q 1.93(is a method of letting a project maintain a mailing list without interaction with the system)
+117 639 R(administration, e)117 651 Q -.15(ve)-.25 G 2.5(ni).15 G 2.5
+(ft)-2.5 G(he alias \214le is protected.)-2.5 E 2.024
+(It is not necessary to reb)142 667.2 R 2.024(uild the inde)-.2 F 4.524
+(xo)-.15 G 4.524(nt)-4.524 G 2.025
+(he alias database when a :include: list is)-4.524 F(changed.)117 679.2
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+(ork Mail Router)-.1 E(SMM:9-7)194.78 E 2.5(3.4. Message)87 96 R
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+(Once all recipient addresses are parsed and v)127 112.2 R .857
+(eri\214ed, the message is collected.)-.15 F .856(The message)5.857 F
+(comes in tw)102 124.2 Q 2.5(op)-.1 G
+(arts: a message header and a message body)-2.5 E 2.5(,s)-.65 G
+(eparated by a blank line.)-2.5 E
+(The header is formatted as a series of lines of the form)127 140.4 Q
+(\214eld-name: \214eld-v)178 156.6 Q(alue)-.25 E(Field-v)102 172.8 Q
+1.366(alue can be split across lines by starting the follo)-.25 F 1.366
+(wing lines with a space or a tab)-.25 F 6.366(.S)-.4 G(ome)-6.366 E
+.211(header \214elds ha)102 184.8 R .511 -.15(ve s)-.2 H .211
+(pecial internal meaning, and ha).15 F .511 -.15(ve a)-.2 H .211
+(ppropriate special processing.).15 F .21(Other headers)5.21 F
+(are simply passed through.)102 196.8 Q
+(Some header \214elds may be added automatically)5 E 2.5(,s)-.65 G
+(uch as time stamps.)-2.5 E .86(The body is a series of te)127 213 R
+.861(xt lines.)-.15 F .861
+(It is completely uninterpreted and untouched, e)5.861 F .861
+(xcept that)-.15 F 1.43(lines be)102 225 R 1.43(ginning with a dot ha)
+-.15 F 1.729 -.15(ve t)-.2 H 1.429(he dot doubled when transmitted o).15
+F -.15(ve)-.15 G 3.929(ra).15 G 3.929(nS)-3.929 G 1.429(MTP channel.)
+-3.929 F(This)6.429 E -.15(ex)102 237 S
+(tra dot is stripped by the recei).15 E -.15(ve)-.25 G -.55(r.).15 G F0
+2.5(3.5. Message)87 261 R(Deli)2.5 E -.1(ve)-.1 G(ry).1 E F1 .028
+(The send queue is ordered by recei)127 277.2 R .029
+(ving host before transmission to implement message batch-)-.25 F 3.07
+(ing. Each)102 289.2 R .57(address is mark)3.07 F .57
+(ed as it is sent so rescanning the list is safe.)-.1 F .57(An ar)5.57 F
+.57(gument list is b)-.18 F .57(uilt as)-.2 F 1.138(the scan proceeds.)
+102 301.2 R 1.139
+(Mail to \214les is detected during the scan of the send list.)6.139 F
+1.139(The interf)6.139 F 1.139(ace to the)-.1 F(mailer is performed using one of the techniques described in section 2.2.)
+102 313.2 Q .996(After a connection is established,)127 329.4 R/F2 10
+/Times-Italic@0 SF(sendmail)3.496 E F1(mak)3.495 E .995(es the per)-.1 F
+.995(-mailer changes to the header and)-.2 F .236
+(sends the result to the mailer)102 341.4 R 5.236(.I)-.55 G 2.736(fa)
+-5.236 G .537 -.15(ny m)-2.736 H .237(ail is rejected by the mailer).15
+F 2.737(,a\215)-.4 G .237(ag is set to in)-2.737 F -.2(vo)-.4 G .437 -.1
+(ke t).2 H .237(he return-).1 F(to-sender function after all deli)102
+353.4 Q -.15(ve)-.25 G(ry completes.).15 E F0 2.5(3.6. Queued)87 377.4 R
+(Messages)2.5 E F1 .163(If the mailer returns a \231temporary f)127
+393.6 R .163(ailure\232 e)-.1 F .162(xit status, the message is queued.)
+-.15 F 2.662(Ac)5.162 G .162(ontrol \214le is)-2.662 F .85
+(used to describe the recipients to be sent to and v)102 405.6 R .851
+(arious other parameters.)-.25 F .851(This control \214le is for)5.851 F
+(-)-.2 E 1.011(matted as a series of lines, each describing a sender)102
+417.6 R 3.511(,ar)-.4 G 1.011(ecipient, the time of submission, or some)
+-3.511 F .776(other salient parameter of the message.)102 429.6 R .776
+(The header of the message is stored in the control \214le, so)5.776 F(that the associated data \214le in the queue is just the temporary \214le that w)
+102 441.6 Q(as originally collected.)-.1 E F0 2.5(3.7. Con\214guration)
+87 465.6 R F1 .493(Con\214guration is controlled primarily by a con\214guration \214le read at startup.)
+127 481.8 R F2(Sendmail)5.492 E F1(should)2.992 E
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+510 R 2.5(oc)-.8 G(hange operating systems \(V6, V7/32V)-2.5 E 2.5(,4)
+-1.29 G(BSD\).)-2.5 E 12.5(\(2\) T)107 526.2 R 2.5(or)-.8 G(emo)-2.5 E
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+(nsert the DBM \(UNIX database\) library)-2.5 E(.)-.65 E 12.5(\(3\) T)
+107 542.4 R 2.5(oc)-.8 G(hange ARP)-2.5 E(ANET reply codes.)-.92 E 12.5
+(\(4\) T)107 558.6 R 2.5(oa)-.8 G
+(dd headers \214elds requiring special processing.)-2.5 E .434
+(Adding mailers or changing parsing \(i.e., re)102 574.8 R .435
+(writing\) or routing information does not require recom-)-.25 F
+(pilation.)102 586.8 Q 1.317(If the mail is being sent by a local user)
+127 603 R 3.817(,a)-.4 G 1.317(nd the \214le \231.mailcf\232 e)-3.817 F
+1.317(xists in the sender')-.15 F 3.817(sh)-.55 G(ome)-3.817 E
+(directory)102 615 Q 2.721(,t)-.65 G .221(hat \214le is read as a con\214guration \214le after the system con\214guration \214le.)
+-2.721 F .222(The primary use)5.222 F
+(of this feature is to add header lines.)102 627 Q 3.25(The con\214guration \214le encodes macro de\214nitions, header de\214nitions, mailer de\214nitions,)
+127 643.2 R(re)102 655.2 Q(writing rules, and options.)-.25 E F0 2.5
+(3.7.1. Macr)102 679.2 R(os)-.18 E F1 .332
+(Macros can be used in three w)142 695.4 R 2.833(ays. Certain)-.1 F .333
+(macros transmit unstructured te)2.833 F .333(xtual informa-)-.15 F .07
+(tion into the mail system, such as the name)117 707.4 R F2(sendmail)
+2.57 E F1 .07(will use to identify itself in error messages.)2.57 F
+1.247(Other macros transmit information from)117 719.4 R F2(sendmail)
+3.747 E F1 1.247(to the con\214guration \214le for use in creating)3.747
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+2.5(nI)-2.5 G(nter)-2.5 E(netw)-.15 E(ork Mail Router)-.1 E/F1 10
+/Times-Roman@0 SF .312(other \214elds \(such as ar)117 96 R .312
+(gument v)-.18 F .312(ectors to mailers\); e.g., the name of the sender)
+-.15 F 2.811(,a)-.4 G .311(nd the host and)-2.811 F .848
+(user of the recipient.)117 108 R .848
+(Other macros are unused internally)5.848 F 3.348(,a)-.65 G .848
+(nd can be used as shorthand in the)-3.348 F(con\214guration \214le.)117
+120 Q F0 2.5(3.7.2. Header)102 144 R(declarations)2.5 E F1 .355
+(Header declarations inform)142 160.2 R/F2 10/Times-Italic@0 SF
+(sendmail)2.854 E F1 .354(of the format of kno)2.854 F .354
+(wn header lines.)-.25 F(Kno)5.354 E .354(wledge of)-.25 F 2.5(af)117
+172.2 S .5 -.25(ew h)-2.5 H(eader lines is b).25 E(uilt into)-.2 E F2
+(sendmail)2.5 E F1 2.5(,s)C
+(uch as the \231From:\232 and \231Date:\232 lines.)-2.5 E 1.201(Most con\214gured headers will be automatically inserted in the outgoing message if the)
+142 188.4 R(y)-.15 E(don')117 200.4 Q 2.5(te)-.18 G
+(xist in the incoming message.)-2.65 E
+(Certain headers are suppressed by some mailers.)5 E F0 2.5
+(3.7.3. Mailer)102 224.4 R(declarations)2.5 E F1 1.756
+(Mailer declarations tell)142 240.6 R F2(sendmail)4.256 E F1 1.756
+(of the v)4.256 F 1.756(arious mailers a)-.25 F -.25(va)-.2 G 1.756
+(ilable to it.).25 F 1.755(The de\214nition)6.755 F .119
+(speci\214es the internal name of the mailer)117 252.6 R 2.619(,t)-.4 G
+.12(he pathname of the program to call, some \215ags associ-)-2.619 F
+2.036(ated with the mailer)117 264.6 R 4.536(,a)-.4 G 2.036(nd an ar)
+-4.536 F 2.036(gument v)-.18 F 2.036
+(ector to be used on the call; this v)-.15 F 2.035(ector is macro-)-.15
+F -.15(ex)117 276.6 S(panded before use.).15 E F0 2.5(3.7.4. Addr)102
+300.6 R(ess r)-.18 E(ewriting rules)-.18 E F1 .458
+(The heart of address parsing in)142 316.8 R F2(sendmail)2.959 E F1 .459
+(is a set of re)2.959 F .459(writing rules.)-.25 F .459
+(These are an ordered)5.459 F .561
+(list of pattern-replacement rules, \(some)117 328.8 R .561(what lik)
+-.25 F 3.061(eap)-.1 G .561(roduction system, e)-3.061 F .56
+(xcept that order is criti-)-.15 F 1.905
+(cal\), which are applied to each address.)117 340.8 R 1.905
+(The address is re)6.905 F 1.906(written te)-.25 F 1.906
+(xtually until it is either)-.15 F(re)117 352.8 Q .308
+(written into a special canonical form \(i.e., a \(mailer)-.25 F 2.807
+(,h)-.4 G .307(ost, user\) 3-tuple, such as {arpanet, usc-)-2.807 F .64
+(isif, postel} representing the address \231postel@usc-isif\232\), or it f)
+117 364.8 R .641(alls of)-.1 F 3.141(ft)-.25 G .641(he end.)-3.141 F
+.641(When a pattern)5.641 F(matches, the rule is reapplied until it f)
+117 376.8 Q(ails.)-.1 E 1.222(The con\214guration \214le also supports the editing of addresses into dif)
+142 393 R 1.221(ferent formats.)-.25 F -.15(Fo)6.221 G(r).15 E -.15(ex)
+117 405 S(ample, an address of the form:).15 E(ucsfcgl!tef)157 421.2 Q
+(might be mapped into:)117 437.4 Q(tef@ucsfcgl.UUCP)157 453.6 Q
+(to conform to the domain syntax.)117 469.8 Q -.35(Tr)5 G
+(anslations can also be done in the other direction.).35 E F0 2.5
+(3.7.5. Option)102 493.8 R(setting)2.5 E F1 1.168(There are se)142 510 R
+-.15(ve)-.25 G 1.169
+(ral options that can be set from the con\214guration \214le.).15 F
+1.169(These include the)6.169 F(pathnames of v)117 522 Q
+(arious support \214les, timeouts, def)-.25 E(ault modes, etc.)-.1 E F0
+2.5(4. COMP)72 546 R(ARISON WITH O)-.74 E(THER MAILERS)-.4 E 2.5
+(4.1. Deli)87 570 R -.1(ve)-.1 G(rmail).1 E F2(Sendmail)127 586.2 Q F1
+(is an outgro)2.5 E(wth of)-.25 E F2(delivermail)2.5 E F1 5(.T)C
+(he primary dif)-5 E(ferences are:)-.25 E 12.5(\(1\) Con\214guration)107
+602.4 R .273(information is not compiled in.)2.773 F .272
+(This change simpli\214es man)5.273 F 2.772(yo)-.15 G 2.772(ft)-2.772 G
+.272(he problems)-2.772 F(of mo)133.66 614.4 Q(ving to other machines.)
+-.15 E(It also allo)5 E(ws easy deb)-.25 E(ugging of ne)-.2 E 2.5(wm)
+-.25 G(ailers.)-2.5 E 12.5(\(2\) Address)107 630.6 R .681
+(parsing is more \215e)3.181 F 3.182(xible. F)-.15 F .682(or e)-.15 F
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+3.182 F(ate)-.05 E -.1(wa)-.25 G 3.182(yt).1 G(o)-3.182 E(an)133.66
+642.6 Q 2.817(yn)-.15 G(etw)-2.817 E .317(ork, whereas)-.1 F F2
+(sendmail)2.817 E F1 .317(can be sensiti)2.817 F .616 -.15(ve t)-.25 H
+2.816(oh).15 G .316(ost names and reroute to dif)-2.816 F .316(ferent g)
+-.25 F(ate-)-.05 E -.1(wa)133.66 654.6 S(ys.).1 E 12.5(\(3\) F)107 670.8
+R(orw)-.15 E 1.627(arding and :include: features eliminate the requirement that the system alias \214le be)
+-.1 F .074(writable by an)133.66 682.8 R 2.574(yu)-.15 G .073(ser \(or that an update program be written, or that the system administration)
+-2.574 F(mak)133.66 694.8 Q 2.5(ea)-.1 G(ll changes\).)-2.5 E(\(4\))107
+711 Q F2(Sendmail)15 E F1 .4(supports message batching across netw)2.9 F
+.401(orks when a message is being sent to mul-)-.1 F(tiple recipients.)
+133.66 723 Q EP
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+(ork Mail Router)-.1 E(SMM:9-9)194.78 E/F1 10/Times-Roman@0 SF 12.5
+(\(5\) A)107 96 R .875(mail queue is pro)3.375 F .874(vided in)-.15 F/F2
+10/Times-Italic@0 SF(sendmail.)3.374 E F1 .874(Mail that cannot be deli)
+5.874 F -.15(ve)-.25 G .874(red immediately b).15 F .874(ut can)-.2 F
+1.063(potentially be deli)133.66 108 R -.15(ve)-.25 G 1.064
+(red later is stored in this queue for a later retry).15 F 6.064(.T)-.65
+G 1.064(he queue also pro-)-6.064 F .896(vides a b)133.66 120 R(uf)-.2 E
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+-.05 F(ably redeli)133.66 132 Q -.15(ve)-.25 G(red e).15 E -.15(ve)-.25
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+([Birrell82] Birrell,)72 148.2 R 1.084(A. D., Le)3.584 F 1.084
+(vin, R., Needham, R. M., and Schroeder)-.25 F 3.584(,M)-.4 G 3.585(.D)
+-3.584 G 1.085(., \231Grape)-3.585 F(vine:)-.25 E(An Ex)180 160.2 Q
+(ercise in Distrib)-.15 E(uted Computing.)-.2 E 5<9a49>-.7 G(n)-5 E/F1
+10/Times-Italic@0 SF(Comm. A.C.M. 25,)2.5 E F0(4, April 82.)2.5 E 59.4
+([Borden79] Borden,)72 176.4 R .796
+(S., Gaines, R. S., and Shapiro, N. Z.,)3.296 F F1 .795(The MH Messa)
+3.295 F .995 -.1(ge H)-.1 H .795(andling Sys-).1 F(tem: User)180 188.4 Q
+(s' Manual.)-.1 E F0(R-2367-P)5 E(AF)-.92 E 5(.R)-.8 G(and Corporation.)
+-5 E(October 1979.)5 E([Crock)72 204.6 Q 52.29(er77a] Crock)-.1 F(er)-.1
+E 2.508(,D)-.4 G 2.508(.H)-2.508 G .008(., V)-2.508 F .009
+(ittal, J. J., Pogran, K. T)-.6 F .009(., and Henderson, D. A. Jr)-.74 F
+(.,)-.55 E F1(Standar)2.509 E 2.509(df)-.37 G(or)-2.509 E .955(the F)180
+216.6 R .955(ormat of ARP)-1.05 F 3.454(AN)-.9 G .954(etwork T)-3.454 F
+-.2(ex)-.92 G 3.454(tM).2 G(essa)-3.454 E -.1(ge)-.1 G(s.).1 E F0 .954
+(RFC 733, NIC 41952.)5.954 F .954(In [Fein-)5.954 F 2.5(ler78]. No)180
+228.6 R -.15(ve)-.15 G(mber 1977.).15 E([Crock)72 244.8 Q 51.73
+(er77b] Crock)-.1 F(er)-.1 E 3.04(,D)-.4 G 3.04(.H)-3.04 G(.,)-3.04 E F1
+-1.55 -.55(Fr a)3.04 H(me).55 E .54(work and Functions of the MS P)-.15
+F(er)-.8 E .54(sonal Messa)-.1 F .74 -.1(ge S)-.1 H(ystem.).1 E F0
+(R-2134-ARP)180 256.8 Q(A, Rand Corporation, Santa Monica, California.)
+-.92 E(1977.)5 E([Crock)72 273 Q 56.73(er79] Crock)-.1 F(er)-.1 E 2.557
+(,D)-.4 G 2.557(.H)-2.557 G .056(., Szurk)-2.557 F -.25(ow)-.1 G .056
+(ski, E. S., and F).25 F(arber)-.15 E 2.556(,D)-.4 G 2.556(.J)-2.556 G
+(.,)-2.556 E F1 .056(An Internetwork Memo Dis-)2.556 F(trib)180 285 Q
+1.341(ution F)-.2 F 1.341(acility \212 MMDF)-.75 F(.)-1.35 E F0 1.341
+(6th Data Communication Symposium, Asilomar)6.341 F(.)-.55 E(No)180 297
+Q -.15(ve)-.15 G(mber 1979.).15 E([Crock)72 313.2 Q 56.73(er82] Crock)
+-.1 F(er)-.1 E 3.383(,D)-.4 G 3.383(.H)-3.383 G(.,)-3.383 E F1(Standar)
+3.383 E 3.383(df)-.37 G .883(or the F)-3.383 F .882
+(ormat of Arpa Internet T)-1.05 F -.2(ex)-.92 G 3.382(tM).2 G(essa)
+-3.382 E -.1(ge)-.1 G(s.).1 E F0(RFC)5.882 E 4.197(822. Netw)180 325.2 R
+1.697(ork Information Center)-.1 F 4.197(,S)-.4 G 1.698
+(RI International, Menlo P)-4.197 F 1.698(ark, California.)-.15 F
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