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====== main.cf ======
http://www.postfix.org/postconf.5.html

debian 範例設定檔放在 /usr/share/postfix 中。

===== Basic =====
==== 變數 ====
引用的變數不需要事先定義
<code>myhostname = host.domain.com
mydestination = $myhostname</code>
<code>mydestination = $myhostname
myhostname = host.domain.com</code>
所以上面兩種設定方式皆可

==== 設定值 ====
以空白、逗號、Tab區隔

==== 外部設定檔 ====
可將設定值擺在外部檔案
<code>mydestination = /etc/postfix/file</code>

==== 註解 ====
# 開頭為註解，只可放在每一行第一個字：
  # 這是註解
  hostname = test.test.com  # 這是不合法的註解

===== 接受外來的連線 =====
<code>inet_interfaces = all</code>

===== 主機名稱 =====
<code>myhostname = mail.abc.orz</code>

===== 主機所在網域 =====
<code>mydomain = abc.orz</code>

===== 可接收的郵件位址 =====
預設只接收和主機名稱相同的信件
<code>mydestination = $myhostname, abc.orz, mail.abc.orz</code>

===== 每封信件的容量上限 =====
  message_size_limit = xxxx
單位為 byte 5120000 = 5MB

===== relay =====
=== mynetworks_style ===
  * subnet - 同子網域
  * class - 同 class
  * host - 只有 localhost
=== mynetworks ===
優先權大於 mynetworks_style
  mynetworks = 1.2.3.4 5.6.7.8
  mynetworks = 7.8.9.0/24
  mynetworks = abc.orz          # *.abc.orz

===== SASL 認證 =====
透過 dovecot 來認證使用者。
  smtpd_sasl_type = dovecot
  smtpd_sasl_path = /var/run/dovecot/auth-client
  smtpd_sasl_auth_enable = yes
  smtpd_sasl_authenticated_header = yes
  smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination

===== TLS 加密 =====
  smtpd_tls_cert_file=/etc/ssl/certs/dovecot.pem
  smtpd_tls_key_file=/etc/ssl/private/dovecot.pem
  smtpd_use_tls=yes
  smtpd_tls_session_cache_database = btree:${queue_directory}/smtpd_scache
  smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache

===== postqueue =====
查詢尚未寄出的郵件
  postqueue -p

==== queue 重送間隔 ====
  queue_run_delay = 1000s    # 5m, 1h, 7d, etc (5 min, 1 hour, 7day)

====== 更改退信訊息 ======
取得 postfix 原始檔，修改其中 src/bounce/bounce_notify_util.c 檔，然後重新編譯

====== 備份 ======
  /etc/postifx
  /etc/passwd
  /etc/shadow
  /etc/group
  /etc/gshadow
  /var/spool/mail
====== Reference ======
Postfix 技術手冊：http://books.google.com/books?id=H9yrO841raoC
====== Amavisd - Anti-Spam / Anti-Virus ======
===== For FreeBSD =====
http://www.wretch.cc/blog/chuchiming/15421032

http://blog.weithenn.org/2009/06/freebsdpostfix-amavisd-new-uvscan.html

經由 Amavisd 橋接，過濾垃圾信及病毒信。

  portinstall security/amavisd-new security/clamav p5-Mail-SpamAssassin
  
編輯 amavisd.conf 設定
  $mydomain = 'domain.name.tw';
  $sa_spam_subject_tag = '***SPAM*** ';
  $sa_tag_level_deflt  = 0;  # add spam info headers if at, or above that level
  $sa_tag2_level_deflt = 6;  # add 'spam detected' headers at that level
  $sa_kill_level_deflt = 25;  # triggers spam evasive actions (e.g. blocks mail)
  
三個數值可依照需要修改。

設定各種問題信件的命運：
<code>
# $final_virus_destiny      = D_DISCARD;
# $final_banned_destiny     = D_BOUNCE;
# $final_spam_destiny       = D_BOUNCE;
$final_bad_header_destiny = D_PASS;
</code>

取消 ClamAV 的註解，並註解掉其他用不到的防毒方式。

  # ### http://www.clamav.net/
  ['ClamAV-clamd',
   \&ask_daemon, ["CONTSCAN {}\n", "/var/run/clamav/clamd.sock"],
   qr/\bOK$/m, qr/\bFOUND$/m,
   qr/^.*?: (?!Infected Archive)(.*) FOUND$/m ],

編輯 postfix/master.cf，加上
<code>
smtp-amavis unix - - n - 2 smtp
  -o disable_dns_lookups=yes
  -o smtp_send_xforward_command=yes

127.0.0.1:10025 inet n - n - - smtpd
  -o content_filter=
  -o local_recipient_maps=
  -o relay_recipient_maps=
  -o smtpd_restriction_classes=
  -o smtpd_client_restrictions=
  -o smtpd_helo_restrictions=
  -o smtpd_sender_restrictions=
  -o smtpd_recipient_restrictions=permit_mynetworks,reject
  -o mynetworks=127.0.0.0/8
  -o strict_rfc821_envelopes=yes
</code>

編輯 postfix/main.cf，加上
  content_filter = smtp-amavis:[127.0.0.1]:10024

編輯 /etc/rc.conf，加上
  amavisd_enable="YES"

編輯 /etc/group，將 amavis 加入 clamav 的群組中，也將 clamav 加入 amavis 群組中
  
重新啟動 postfix、amavisd、clameav。
==== 參考 ====
  * http://www.ijs.si/software/amavisd/
  * http://antbsd.twbbs.org/~ant/FNP/Old/amavisd-new.htm
  * http://www.freebsddiary.org/virus-scanning.php
  * http://www200.pair.com/mecham/spam/bypassing.html
  * http://wiki.shsh.ylc.edu.tw/index.php/MailServer

===== Debian =====
http://www.debian.org.tw/index.php/Amavisd-new
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