книги / Электронная почта

S3

#

handle

null

input

(translate

to

<@>

special

case)

R$@

$@

<@>

#

basic

textual

canonicalization

note

RFC733

heuristic

here

R$*<$*>$*<$*>$*

$2$3<$4>$5

strip

multiple

о

<>

R$*<$*<$+>$*>$*

<$3>$5

2-level

<>

nesting

R$*<>$*

$@

<@>

MAIL

FR0M:<>

case

R$*<$+>$*

$2

basic

RFC821/822

parsing

#

handle

list:;

syntax

as

special

case

$@

$1

<@>

#

make

sure <@a,@b,@c: user@d>

syntax is

easy

to

parse

undone

later

R@

$+

,

$+

@

$1

$2

change

all

to

#

localize

and

dispose

of

route-based

addresses

R@

$+

$+

$@

$>96

<

@$1

>

$2

handle

<route-addr>

#

find

focus

for list

syntax

R

$+

$*

@

$+

$@

$>96

$1

$2

<

@

$3

>

list

syntax

R

$+

$*

;

$9

$1

$2;

list

syntax

#

find

focus for

©

syntax

addresses

R$+

©

$+

$:

$1 <

9

$2

>focus

on

domain

R$+

< $ + © $ + >

$1

$2

<

©

$3

>

move

gaze

right

R$+

<

@ $+

>

$©

$>96 $ 1

<

©

$2

>

already

canonical

#

do

some

sanity

checking

R$*

<

© $*

$* >

$*

$1

<

@

$2

$3

> $4

nix

colons

in

addrs

ft convert old-style addresses to a domain-based

address

R$-

! $+

$@

$>96

$2

<

©

$1.UUCP

>

resolve

uucp

names

R$+

$- ! $+

$@

$>96

$ 3

<

©

$1

$2

>

domain

uucps

R$+

! $+

$@

$>96

$2 <

©

$1

.UUCP >

uucp

subdo­

mains

#

if

we

have

X

signs,

take

the

rightmost

one

R$*

X $*

$1

©

$2

First

make

them

all

@s.

R$*

© $ * © $ *

$1

X

$2

©

$3

Undo

all

but

the

last.

R $*

© $*

$@

$>96

$1 <

©

$2

>

Insert

<

>

and

finish

#

handle

special

cases

for local

names

R$*

< @

localhost

>

$*

$:

$1 <

@

$j

> $2

no

domain

at

all

R$*

<

@

localhost

$m

>

$*

$:

$1

<

@

$j

>

$2

local

domain

R$*

< @

localhost

UUCP

>

$* $: $1

<

@ $j

>

$2

.UUCP

domain

R$* < < § > [ $ + ] > $ *

$: $1 < @@ [ $2 ] > $3

mark

[a.b.c.d]

R$*

< m $=w > $*

$:

$1 < @ $j

> $3

self-literal

R$*

< @@

$+

>

$*

$@

$1

< @

$2 >

$3

canon

IP

addr

#

pass

UUCP

addresses straight

through

R$*

<

@

$+

UUCP

>

$*

$@

$1

<

@

$2

UUCP

>

$3

#

pass

to

nameserver

to

makehdstname

canonical

R$*

< @ $* $"P > $*$: $1 <

@ $[ $2

$3

$] >

canonical

R$* < @

$=w > $*

$: $1 < @ $2

> $3

R$* < <$$* $=P >

$* $: $1 < @ $2

$3

> $4

R$* < @ $*

> $*

$1

< @ $2

> $3

# if this is the

local

hostname, make sure

we

treat is

as canonical

R$* < @ $j > $*

$: $1

< @ $j

> $2

R<@

$+>

$#error

$@

USAGE

$:

"user

address

required"

R<$*

$*

>

$#error $@ USAGE $: "colon illegal

in

host

name

part"

#

handle

numeric

address

spec

R$*

<

©

[

$

+

]

>

$

*

$:

$>98

$1 <

@

[ $2 ] >

$3

numeric

internet

spec

R$*

<

©

[

$

+

]

>

$

*

$#smtp

$@ [$2] $: $1 <

C$2]

>

$3

still

numeric:

send

#

now

delete

the

local

info

note

$=0 to find

characters

that

cause forwarding

R$* < @

>

$*

$@

$>97

$1

user® =>

user

R<

@

$=w

>

$*

$@

$>97

$2

©here:

->

R$* $=0 $*

<

@

$=w

>

$®

$>97 $1

$2

$3

...@here

->

R$+ < @

$=w

>

$:

$1

<

@ $2

®

$H

>

first

try

hub

R$+

<

$+

@

$+

>

$#local

$:

$1

yep

R$+ < $+

@

>

$#local

$;

@

$1

nope,

local

address

#

resolve

remotely

connected

UUCP

links

(if any)

#• resolve

fake

toplevel

domains

by

forwarding

to

other

hosts

R$*<@$+. BITNET. >$* $:

$>95

<

$B

> $1

<@$2.BITNET.>

$3

user@host.BITNET

#

forward

non-local

UUCP

traffic

to

our

UUCP

relay

R$*<@$*.UUCP.>$*

$:

$>95

<

$Y

>

$1

<@$2.UUCP.> $3

uucp

mail

###

SMTP Mailer

specification

#####################################

Msmtp,

P=[IPC],

F=mDFMuX,

S=11/31, R=21, E=\r\n,

L=990,

A=IPC

$h

Mesmtp,

P=[IPC],

F=mDFMuXa,

S=11/31,

R=21,

E=\r\n,

L=990,

A=IPC

$h

Mrelay,

P=[IPC],

F=mDFMuXa,

S=11/31,

R=61,

E=\r\n,

L=2040, A=IPC

$h

###

envelope

sender

and masquerading

recipient

###

rewriting

S11

R$+

$:

$>51

$1

sender/recipient common

R$*

<@>

$@

$1:;

list:; special case

R$*

$@

$>61

$1

qualify unqual'ed

names

#

telnet

citmgu.ru

25

Trying

194.85.135.66.

Connected

to

citmgu.ru.

Escape

character is

220

cit-u.citmgu.ru

ESMTP

Sendmail

8.8.5/8.8.5;

Mon,

30 Jun 1997 09:45:55 GMT

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