PPoossttffiixx³³å

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ΥɥȤPostfix³åμˤĤƵҤƤޤ
PostfixС2.2ʹߤǻȤޤ

ΥɥȤСƤ:

  * SMTP³å夬Ǥ뤳
  * ³åμ
  * ³å
  * ³åΰ
  * ³å
  * ³å׾

SSMMTTPP³³å夬Ǥ뤳

SMTP³åȤȡPostfixƱSMTP³ʣΥå
뤳ȤǤޤǥեȤǤϡ褬 active 塼̤Υ᡼
ƤȡPostfix 2.2ϼưŪSMTP³Ѥޤ

SMTP³åϥѥեޥ󥹤εǽǤºݤ˥ѥեޥ󥹤夹뤫
ɤϾˤޤ:

  * ʣΥ᡼륵Ф˥᡼ˤϡPostfix
    ʤФФȤʤ뤿ᡢSMTP³åˤä礭
    ѥեޥ󥹤夹ǽޤ

  * ǤʤСSMTP³åϾʤΤǤ: TCPϥ
     (SYN, SYN+ACK, ACK) Υ쥤ƥ󥷤ʤ˲äSMTP
    ǽΥϥɥ (220 greeting, EHLO command, EHLO response) 
    쥤ƥ󥷤ʤޤ

  * SMTPåʬȤǤϡSMTP³åˤϲ
    ޤPostfix smtp(8) 饤Ȥ̾ QUIT ޥɤФ
    ФαԤTCPκǸΥϥɥλΤԤĤȤ
    ޤ

  * SMTP³åˤϤ餫Сإåɤޤ: ³ޤ
    Ȥ뤫ɤΤ뤿ˡ MAIL FROM ޥɤ˥饤Ȥ
    RSET ޥɤɬפޤ

ʳŪSMTP³åϡΥɥȤκǸˤ
¤ε򻲾ȤƤ

³³åμ

PostfixΥ᡼ˡγפϡPostfixƥ OVERVIEW ɥȤ
ȤƤ

Postfix³åPostfix᡼ץ֤Ƕͭޤˤ
줿³Ѥ뵡񤬺粽ޤSendmaileximΤ褦¾
MTAˤͭ³å夬ޤǤϡ³ä᡼
ץ³ѤǤޤͭ³åƱ
ѥեޥ󥹤夵褦Ȥȡͭ³Ĺֳ³ɬפ
ޤ

    Internet <-- smtp(8)  <-> scache(8)  <-> smtp(8)  --> Internet
                                                 

PostfixС2.2Ƴ줿 scache(8) Ф϶ͭ³å
ޤPostfixС2.2Ǥϡsmtp(8) 饤ȤΥå
ݡȤƤޤ

SMTP³å夬ͭˤʤäƤ (Υ󻲾)smtp(8)
饤Ȥϥ᡼θ³ڤ餺³ scache(8) ФϤ
scache(8) Фϸ¤줿֤δ֡³򳫤³ޤ

³ scache(8) Ф˰Ϥ塢smtp(8) 饤Ȥ¾Υ᡼
׵ν³ޤδ֡줫 smtp(8) 饤ȥץ
scache(8) Ф˥å夵줿³׵ᤷ᡼˺Ѥ뤫
ޤ

³åΥɥᥤ̾ (ԥɥ쥹α¦ʬ) ³ۥȤ
IPɥ쥹ˤäƸޤˤꡢ⡼ȥۥȤۤʤ̾
ɥᥤΥ᡼륵ФǤäƤPostfix³ѤǤ褦ˤʤޤ

³³å

Postfix smtp(8) 饤Ȥ2Ĥ³åά򥵥ݡȤƤޤ:

  * ǥޥ³å塣ϥǥեȤͭˤʤäƤꡢ
    smtp_connection_cache_on_demand ѥ᡼椵ޤεǽ
    ͭˤʤäƤȡ褬 active 塼̤Υ᡼Ƥ
    Postfix smtp(8) 饤ȤϼưŪ³³å¸
    ޤ

    :

        /etc/postfix/main.cf:
            smtp_connection_cache_on_demand = yes

  * 褴Ȥ³å塣 smtp_connection_cache_destinations
    ѥ᡼Ūꥹȥåפ뤳Ȥͭ
    ʤޤ򤵤줿ؤȡPostfix smtp(8) 饤Ȥ
    ³³å¸ޤ

    ޤϵΥꥹȤ򥫥ޤޤ϶Ƕڤäƻꤷޤ:

      o ᡼뤬졼ۥȤȤ鷺: ɥᥤ̾ (E᡼
        ɥ쥹α¦ʬIPɥ쥹 [] ĤƤʤ)

      o ᡼뤬졼ۥȷͳ: 졼ۥ̾ ([] Τʤ
        ޤǥեTCPݡ) ǡmain.cf  transport ޥåפǻ
        줿Ρ

      o ɥᥤ̾ν񤫤줿 /file/name ǻꤵ줿褦ʥ졼ۥ̾

      o ɥᥤ̾졼ۥ̾¦˽񤫤줿 "type:table""type:table"
        α¦ʬη̵̤뤵ޤ

    :

        /etc/postfix/main.cf:
            smtp_connection_cache_destinations = $relayhost
            smtp_connection_cache_destinations = hotmail.com, ...
            smtp_connection_cache_destinations = static:all (侩Ǥޤ)

³³åΰ

³åϹȤʤФޤ󡣻ȤʤSMTP³Ĺ֤
錄äƳ³ΤҲŪǡޤʿΥåƱ³
ΤϸޤSMTP³å򤱤뤿ˡPostfix
ʲΰƤޤ:

  * Postfix scache(8) Фϸ¤줿֤³򳫤³ޤλ
    ¤ smtp_connection_cache_time_limit  connection_cache_ttl_limit
    ѥ᡼ǻꤷޤˤҲŪʿ񤤤򤷤ʤ褦
    ޤ

  * Postfix smtp(8) 饤Ȥϸ¤줿åѤޤ
    ˤ1ĤΥåʣ³򰷤ʤΥХ˰äʤ
    褦ˤޤѲ smtp_connection_cache_reuse_limit ѥ᡼
    ¤ޤ

  * ³åϥå夵줿³줾Ūɥᥤ
    IPɥ쥹Ȥä٥դޤ³å帡
    ꤵ줿ȤΤޤˤ᡼ߥɤޤ

³³å

Postfix SMTP³åϤΥץꥱȾͤޤ:

  * ¸줿TLSåϿ³줿ȤˤȤʤᡢ
    Postfixͭ³åTLSǤϻȤޤ (¤³ä
    ץ³Ѥ³åˤ¸ߤޤ)
    ΤᡢPostfix smtp(8) 饤ȤTLSȤä᡼λԤ
    λ顢³Ĥޤ

  * Postfix³åϸ1ĤΥ᡼륵ФФƤʣSASLȤ
    ݡȤƤޤ󡣶ŪˤϡPostfix³åSASL
    Ʊ᡼륵IPɥ쥹ƱTCPݡȤ뤹٤ƤΥۥ̾
    ɥᥤ̾ФͭǤ뤳ȤȡSASLϥåԤ˰¸
    ʤȤꤷƤޤ

³³å׾

scache(8) ³å奵Фϥå奵Υԡ䥭åΥҥåΨ
Ȥä׾˵Ͽޤξ
connection_cache_status_update_time äȤȡ祢ɥ֤Ķᤷ
ץλȤPostfixɤ줿Ȥ˵Ͽޤ

  * ɥᥤˤ³å帡ΥҥåΨˤäơ³å夬
    ɤͭ狼ޤ

  * ƱMXۥȤͭۤʤɥᥤ˥᡼äƤΤǤʤС
    ͥåȥɥ쥹ˤ³å帡Ͼ˼Ԥޤ

  * ³åؤΥԤʤС׾ϵϿޤ

