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ENC0/Times-Bold RE/Times-Italic@0 ENC0/Times-Italic RE/Times-Roman@0 ENC0/Times-Roman RE%%EndProlog%%Page: 1 1%%BeginPageSetupBP%%EndPageSetup/F0 14/Times-Roman@0 SF(Mail Systems and Addressing)204.196 141 Q(in 4.2bsd)262.331 157.8 Q/F1 10/Times-Roman@0 SF(Eric Allman*)260.92 181.8 Q/F2 10/Times-Italic@0 SF(Britton-Lee)254.86 199.8 Q 2.5(,I)-.1 G(nc.)309.2 199.8 Q(1919 Addison Str)225.13 211.8 Q(eet, Suite 105.)-.37 E(Berk)232.645 223.8 Q(ele)-.1 E 1.1 -.55(y, C)-.3 H(alifornia 94704.).55 E F1(eric@Berk)244.175241.8 Q(ele)-.1 E -.65(y.)-.15 G(ARP).65 E(A)-.92 E(ucb)264.6 253.8 Q -.25(va)-.15 G(x!eric).25 E(ABSTRA)262.085 286.2 Q(CT)-.4 E .966(Routing mail through a heterogeneous internet presents man)112 302.4 R 3.466(yn)-.15 G 1.466 -.25(ew p)373.438 302.4 T 3.466(roblems. Among).25 F .297(the w)112 314.4 R .297(orst of these is that of address mapping.)-.1 F(Historically)5.297 E 2.797(,t)-.65 G .298(his has been handled on an)355.03314.4 R(ad hoc basis.)112 326.4 Q(Ho)5 E(we)-.25 E -.15(ve)-.25 G .8 -.4(r, t).15 H(his approach has become unmanageable as internets gro).4 E -.65(w.)-.25 G.099(Sendmail acts a uni\214ed \231post of)112 342.6 R .098(\214ce\232 to which all mail can be submitted.)-.25 F .098(Address inter)5.098F(-)-.2 E .754(pretation is controlled by a production system, which can parse\ both old and ne)112 354.6 R 3.255(wf)-.25 G(or)452.54 354.6 Q(-)-.2 E .242(mat addresses.)112 366.6 R .242(The ne)5.242 F 2.742(wf)-.25 G .242(ormat is \231domain-based,)216.578 366.6 R 2.742<9a618d>-.7 G -.15(ex)334.326366.6 S .241(ible technique that can handle).15 F(man)112 378.6 Q 2.606(yc)-.15G .106(ommon situations.)141.116 378.6 R .106(Sendmail is not intended to perform user interf)5.106 F .107(ace functions.)-.1 F .399(Sendmail will replace deli)112 394.8 R -.15(ve)-.25 G .399(rmail in the Berk).15 F(ele)-.1 E 2.899(y4)-.15 G .399(.2 distrib)320.504394.8 R 2.899(ution. Se)-.2 F -.15(ve)-.25 G .399(ral major hosts).15 F .421(are no)112 406.8 R 2.921(wo)-.25 G 2.921(rw)152.022 406.8 S .421(ill soon be running sendmail.)165.493 406.8 R .421(This change will af)5.421 F.422(fect an)-.25 F 2.922(yu)-.15 G .422(sers that route)407.056 406.8 R 1.5(mail through a sendmail g)112 418.8 R(ate)-.05 E -.1(wa)-.25 G 5.3 -.65(y. T).1 H 1.5(he changes that will be user visible are empha-).65 F(sized.)112 430.8Q .906(The mail system to appear in 4.2bsd will contain a number of changes.)97475.2 R .906(Most of these changes are)5.906 F .469(based on the replacement of)72 487.2 R F2(delivermail)2.969 E F1 .469(with a ne)2.969 F 2.969(wm)-.25 G .469(odule called)292.871 487.2 R F2 2.97(sendmail. Sendmail)2.97 F F1 .47(implements a gen-)2.97 F 1.834(eral internetw)72 499.2 R 1.834(ork mail routing f)-.1 F(acility)-.1 E 4.333(,f)-.65 G 1.833(eaturing aliasing and forw)239.739 499.2 R 1.833(arding, automatic routing to netw)-.1 F(ork)-.1 E -.05(ga)72 511.2 S(te).05 E-.1(wa)-.25 G .205(ys, and \215e).1 F .205(xible con\214guration.)-.15 F .205(Of k)5.205 F .505 -.15(ey i)-.1 H .205(nterest to the mail system user will be the changes in the net-).15 F -.1(wo)72 523.2 S(rk addressing structure.).1 E .624(In a simple netw)97 539.4 R .624(ork, each node has an address, and resources can be identi\214ed with a host-\resource)-.1 F .374(pair; in particular)72 551.4 R 2.874(,t)-.4 G .374(he mail system can refer to users using a host-username pair)149.932 551.4 R5.374(.H)-.55 G .375(ost names and numbers)409.276 551.4 R(ha)72 563.4 Q .3-.15(ve t)-.2 H 2.5(ob).15 G 2.5(ea)108.31 563.4 S(dministered by a central authority)119.69 563.4 Q 2.5(,b)-.65 G(ut usernames can be assigned locally to each host.)263.82 563.4 Q .397(In an internet, multiple netw)97 579.6 R .396(orks with dif)-.1 F .396(ferent characteristics and managements must communicate.)-.25 F .389(In particular)72 591.6 R 2.889(,t)-.4 G .389(he syntax and semantics of resource identi\214cation change.)129.308 591.6 R
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