e
= Basics of Internet Mail System

not ready.
j
= 󥿡ͥåȥ᡼δ

== ᡼륷ƥ

=== ᡼

ޤ᡼뤽켫ΤǤ
᡼ϴŪˤϥƥȥեǤꡢإå (header) 
ܥǥʬƤޤإåν񼰤ϵʤ꤫ʤ긷̩
ƤޤܥǥˤϤޤ󡣤Ȥаʲ
᡼Ǥ

--
Return-Path: <ruby-list-admin@ruby-lang.org>
Received: from helium.ruby-lang.org (localhost [127.0.0.1])
	by helium.ruby-lang.org (Postfix) with ESMTP
	id 4EEF9165; Wed, 12 Dec 2001 07:05:58 +0900 (JST)
Received: from doraemon.edit.ne.jp (doraemon.edit.ne.jp [210.141.234.1])
	by helium.ruby-lang.org (Postfix) with ESMTP id 7AFAB126
	for <ruby-list@ruby-lang.org>; Wed, 12 Dec 2001 07:05:57 +0900 (JST)
Date: Wed, 12 Dec 2001 07:05:58 +0900
Posted: Wed, 12 Dec 2001 07:14:16 +0900
From: Minero Aoki <aamine@mx.edit.ne.jp>
Reply-To: ruby-list@ruby-lang.org
Subject: [ruby-list:32880] Re: RAA update
To: ruby-list@ruby-lang.org (ruby mailing list)
Message-Id: <20011212071416N.aamine@mx.edit.ne.jp>
In-Reply-To: <20011210141226.DTUM11600.femail11.im.home.ne.jp@witch>
References: <20011210141226.DTUM11600.femail11.im.home.ne.jp@witch>
Mime-Version: 1.0
Content-Type: Text/Plain; charset=iso-2022-jp
Content-Transfer-Encoding: 7bit
Precedence: bulk
Lines: 79
X-UIDL: b8b1b7f1d28ee02af1df6f8612b5b8c4

ǤܥǥǤ
   
(ʲά)
--

إåȥܥǥ϶ԤǶڤޤإåǤϤԤ
ҤȤĤΥإåޤǻϤޤԤϾιԤ³Ǥ
ȤФΥ᡼ Received: ĤȤ 3 ԤǤҤȤĤΥإåԤ
ƤޤƥإåˤϺǽ˥إå̾ꡢ()
֤ƤΤȤ֥إåեɡ(إå)Ǥ

إåˤϤ줾䤬ޤȤ To: إåˤ
᡼ΰ񤭤ޤFrom: ˤϥ᡼긵񤭤ޤ
Subject: Ϥ̾ǤDate: ϥ᡼
Received: ϿʤɤʤɡܤϤȤޤ

=== ᡼

٤ɵ᤹ˤ⤤ˡΤǤ̤
Ƥ¤طʤƤϤʤΤ SMTP (Simple Mail Transfer Protocol)
ǤϡȤۥȤ̤ΥۥȤ˥᡼ž
Υץȥ («ν) ǤȤˤȤ
᡼žǤޤSMTP Ǥϥ᡼ȤˤϴŪ˴Ϳ
ޤ󡣾ʤȤ⡢᡼ȤѤƤޤ褦Ư
ϹԤޤ

ޤ᡼ˤּפȤΤϤޤǤ
Ū˥᡼륷ƥϾ³ܤǡ᡼ä
¨¤ޤ (SMTP ) 뤳ȤˤʤäƤǤ
ޤǸзӥ᡼ߤʤΤǤ

ȤΤ³ǤʤȤФƤơˡ
ͤϤޤǽФƤˡΤҤȤĤǶȤäƤ
ּפʤ櫓Ǥˤ̤ POP3 (Post Office Protocol version 3)
ȤץȥȤޤ

POP3 Ǥϡ줿᡼ POP Ф¸Ƥ
(PPP ǤĤʤѥȤ) ꥯȤ줿Ϥ
ȾäޤĤޤϡԵפȤǤۤ
Ǥ礦

¾βˡȤƤ IMAP (Internet Messsage Access Protocol) 
ץȥ뤬ɽʤǤPOP ϥ᡼Ǥ
IMAP Ǥ̤Υ᡼륯饤ȤεǽΰޤǤФ˼
ޤ줿褦ʴˤʤޤȤ IMAP оǥ᡼
򤷤ꡢ᡼ܥåʬबǤꤷޤӥ᡼
ʤ󤫤ϼ¤ IMAP ι¤ǤӤ CPU ѥʤΤǡ
оǥ᡼ùƷӤϤƤΤǤ

=== ᡼ܥå

Ϥ᡼ǽŪ¸ƤȤ᡼ܥåǤ
äȤɤʹȤǤ INBOX ȤּȢפȤ
͹ؼפǤ

᡼ܥåϡ᡼鼡ǤǤѤ뤳ȤǤƤޤ
ΤˤबޤĶͭ̾ʤΤǤ UNIX mbox
(˥ޥʡС󤬤Ĥ)MHMaildir ʤƤΤ
ޤ

ʤˤƤ᡼ܥåϥ᡼ȤäƤФΤǤ
ˤĤƤϿɵᤷʤȤˤޤ礦


== ᡼륷ƥ

᡼ϸߤʤǤϤۤȤɺǸŻθŤƥǤ顢
꤬̤ͭۤɤޤʲĤ󤲤ޤ礦ޤ
顣

  * 8 ӥåƩǤʤ
  * ASCII ʸʳȴ
  * ᡼ To:  SMTP  To (RCPT TO) ̵ط
  * ᡼ From:  SMTP  From (MAIL FROM) ̵ط

᡼뼫ΤˤĤơ

  * ASCII ʸʳȥХ᡼餬 (äѤ) 
  * إåν񼰤Ķʣ
  * ݲβǤʣˤʤä
  * ˿ҤΥ᡼餬ʤ̵뤷᡼ФäΤ
    Ϥɤˤʤʤ餤ʣˤʤä

᡼ܥåˤĤơ

  * बꤹƤɤȤФΤ狼ʤ
  * बꤹбʤƤǤʤ
  * बꤹƸߴ꤬ (褯) Ф
  * äѤ 8 ӥåƩǤʤ

ʤ櫓ǡTMail ԤΤˤϤʤͳ
ΤǤ¿ɤ٤ƤܤĤ֤äƤ


== ᡼λľ

᡼إå˳ǼƤˤĤƾܤ⤷ޤ
äȾܤƤ񼰤ˤĤΤꤿͤ
<a href="http://www.ietf.org/rfc/rfc2822.txt">RFC2822</a>
ʤɤ򸫤Ȥ褤Ǥ礦

: To:
    衣ʣɥ쥹Ǽ
: From:
    硣ʣɥ쥹Ǽ
    (̾ҤȤĤʣΤȤ Sender: ĤʤФʤ)
: Subject:
    ꡣ᡼˽񤤤ƤǶŽ̤Ρ
    ̾פȤϤäȰ㤦
: Date:
    ᡼ää֤Ǥ񤤤֤Ǥʤ

: Message-Id:
    ˤƥ᡼Ȱаб (ʤФʤʤ)
    ʸ󡣥᡼ۥȤ FQDN (ۥ̾) Ȼ
    ץå IDʸʤɤȤäƺΤ
    PPP ³ʥѥäꤹ FQDN ʤΤǺ롣
    ȤϡʤΤΤǥץХΥ᡼륵Ф FQDN Ŭ
    ʸ򤯤äĤƻȤʤȻפ

    ʤߤ sendmail (ͭ̾ SMTP ) Ͼ˥å ID
    ĤƤΤǡԤΤ褤⤷ʤ
    qmail ʤ󤫤ϤĤƤʤʤΤ˽ʤХ᡼餬
    դΤ
: In-Reply-To:
    Υ᡼롢ֿоݤΥ᡼롢Υå ID
    ξȤäֿطĥ꡼ˤȤ褯
    ֥åɽפˤʤ롣
: References:
    Υ᡼뤬ֿ᡼롢ֿ᡼롢ֿ᡼ġ
    ȺƵŪˤɤäƽ᤿᡼Υå ID ν硣
    In-Reply-To Ʊ褦ˡ᡼륹åɤΤ˻Ȥ롣

    Ūˤϴط᡼ ID 뤬
    ¿ȤϸŤΤάƤ褤Ȥ 12 ĤȤ

: Reply-To:
    ᡼ֿȤ˻Ȥɥ쥹Υإå
    Ф From: ˥᡼֤ƤϤʤ
: Received:
    ϩ󡣥᡼륷ƥΥǥХå SPAM ȯ
    Ȥ˻Ȥ롣Ȥ⤢롣ñ˵¤Ǥ뤫鿮
    ƤϤʤʤ

: X-*:
    X- ƬˤĤƤإåϵʤǷ줿ΤǤϤʤ
    Ĥޤϼͳͭ̾ʤȤǤ X-Mailer (᡼̾)Ȥ

: Mime-Version:
    Content-* إåĤʤɬĤʤФʤ
    ޤΤȤ "1.0"

    MIME Ȥ Multipurpose Internet Mail Extentions ά
    ޤƱѤ᡼˴طʤʤȤ˻ȤƤ롣
: Content-Type:
    ᡼ȤʤǤ뤫ʤǤ뤫Ȥϡ
    ȤС֥ץ졼ƥȤǤפȤJPEG ǤפȤ
    ¯˸ȤΡMIME ססContent Type μ˴ؤƤ
    ΥǾܽҡ
: Content-Disposition:
    ᡼ΰդȤȤ櫓狼ʤƤ
    ȡޥѡȥ᡼ΤȤ˥ѡȤ¾ΥѡȤ
    ɤطˤ뤫򼨤ΡȤ HTML Ȥ
    äƤ볨Ȥȡ꤫ϡġĤäƤۤ
    ʤ顢ʤɤƤꤿмʬĴ٤ơ
: Content-Transfer-Encoding
    Ҥ褦 SMTP  8 ӥåƩǤʤΤǡ8 ӥåȤ᤬
    ΩäƤȤϤʤˤ󥳡ɤ롣Ȥ
    Υإå Base64 Ȥ񤤤ꤹ롣


== Content Type

ͭ̾ Content Type ˤϰʲΤ褦ʤΤ롣

  * text/plain
  * text/html
  * image/gif
  * image/png
  * image/jpeg
  * application/octet-stream
  * multipart/mixed  (Υ򻲾)

ޡ狼Ǥ硣ޤ text ˤ charset Ȥ
ѥ᡼ĤΤǡʸɤΥ󥳡ǥ󥰤
ؼ롣 charset ȥ󥳡ǥ󥰤ʪǤΤ
ä󵬳ʤǷޤäƤޤäʾϤñѤʤΤ
桹˴ط charset ͤϼΤ󤯤餤

  * us-ascii
  * iso-2022-jp
  * iso-2022-jp-2   (iso-2022-jp ڹȤˤбƳĥ)
  * euc-jp
  * shift_jis
  * utf-8

̤ܸȤʤ iso-2022-jp (JIS) ȤäƤФ褤Ȥ
٤( NKF.nkf('-j',str) ǥܥǥѴ뤳)


== ޥѡȥ᡼

Content-Type: multipart/* ΤȤ᡼ϥޥѡȥ᡼
ȤΤˤʤäƤ롣Ǹȡ᡼ܥǥˤޤ᡼뤬
äƤΤǤ롣¯˸źեեפϤȤä
ƥȤΥ᡼ȲΥ᡼ҤȤĤΥ᡼˴ޤƤ櫓
ĤޤźդȤϸäƤǤϥƥȤȲ¤Ǥ롣


== Ūޥʡ MIME ĥ

=== ʬ᡼

ҤȤĤΥ᡼ʣΥ᡼ʬ䤷뤳ȤǤ롣
ΤȤ Content-Type: message/partial꤫
RFC2046 򻲾ȡ

᡼뤬ǤʤꤹΥեȤ
ˤȤäƤ֤ä뤳ȤΤǤȤ޸롣
꤬ʬ᡼Ǥ뤳ȤݾڤʤФ
Ǥʤʤ餽ʤȤ򤷤ƤϤʤ긵
顼֤٤Ǥ롣

=== ƥƥ

᡼Τ̤ΤȤ֤ƤΡȤ URL 
ꤹ롣Content-Type: message/external-body꤫
RFC2046 򻲾ȡ

ɤǻȤäƤȻפäƤIETF Υʥ ML 
ȤäƤ󥿡ͥåȥɥեȤȤФȡإå
᡼˽񤤤Ƥä external-body ΤؤƤ롣
ʤʤƤ IETF Ȥʤä麾
(IETF ϥ󥿡ͥåȤǻȤʤޤȤƤΤǤ)