shell> apt-get install postfix 
shell> apt-get install procmail
shell> apt-get install dovecot-common dovecot-pop3d dovecot-imapd dovecot-postfix

shell> postalias hash:/etc/aliases

disable_plaintext_auth = no

shell> dpkg-reconfigure postfix

shell> postconf
shell> postconf -m
shell> postconf -n

shell> postconf mail_version
shell> postconf myhostname
shell> postconf mydestination

shell> postconf default_destination_concurrency_limit
shell> postconf default_destination_recipient_limit
shell> postconf default_process_limit
shell> postconf hash_queue_depth

smtpd_sender_restrictions = reject_unknown_sender_domain
smtpd_sender_restrictions = reject_unknown_sender_domain,
    check_sender_access hash:/etc/postfix/access

The Spamhaus Block List

SBL

myorigin = $myhostname
myorigin = $mydomain

accept_domain = test.net 
mydestination = $accept_domain

mydestination = $myhostname localhost.$mydomain localhost
mydestination = $myhostname localhost.$mydomain localhost $mydomain
mydestination = $myhostname localhost.$mydomain localhost www.$mydomain ftp.$mydomain

mynetworks_style = subnet
mynetworks_style = host

mynetworks = 172.168.96.0/24
mynetworks = 127.0.0.0/8
mynetworks = 127.0.0.0/8 168.100.189.2/32
mynetworks = 168.100.189.0/28, 127.0.0.0/8

masquerade_domains = $mydomain

relay_domains = $mydestination
relay_domains =
relay_domains = $mydomain
relay_domains = example.com, .example.com

relayhost =
relayhost = $mydomain
relayhost = [mail.$mydomain]
relayhost = [mail.isp.tld]

proxy_interfaces = 1.2.3.4

virtual_alias_domains = example.com ...other hosted domains...
virtual_alias_maps = hash:/etc/postfix/virtual

notify_classes = resource, software

[email protected] postmaster
[email protected]       joe
[email protected]      jane

shell> postmap /etc/postfix/virtual
shell> postfix reload

參考網站：

Postfix Virtual Domain Hosting Howto

shell> postfix reload

shell> postfix check
shell> egrep '(reject|warning|error|fatal|panic):' /some/log/file

參考網站：

BASIC_CONFIGURATION_README

permit_mynetworks
permit_sasl_authenticated

message_size_limit (default: 10240000)
mydestination (default: $myhostname, localhost.$mydomain, localhost)

shell> postconf -e 'myhostname = mail.example.com'
shell> postconf -e 'mydomain = example.com'
shell> postconf -e 'myorigin = $mydomain'

shell> postconf -e 'smtpd_banner = $myhostname ESMTP $mail_name'
shell> postconf -e 'smtpd_use_tls = no'
shell> postconf -e 'home_mailbox = Maildir/'
shell> postconf -e 'inet_protocols = ipv4'
shell> postconf -e 'smtpd_client_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_rbl_client zen.spamhaus.org'

shell> postconf -e 'message_size_limit = 0'
shell> postconf -e 'smtpd_recipient_limit = 1000'

shell> postconf -e 'append_dot_mydomain = no'
shell> postconf -e 'append_at_myorigin = no'

shell> postconf -e 'maximal_queue_lifetime = 0'
shell> postconf -e 'bounce_queue_lifetime = 0'

shell> postconf -e 'disable_vrfy_command = yes'
shell> postconf -e 'smtpd_helo_required = yes'

shell> service dovecot restart
shell> service postfix restart

shell> postqueue -d
shell> postsuper -d queue_id
shell> postsuper -d ALL
shell> postcat -q queue_id

shell> apt-get install fetchmail
shell> vim ~/.fetchmailrc

shell> grep sasl_method=LOGIN /var/log/mail.log

shell> qshape -s hold | head
shell> qshape -s active
shell> qshape active

shell> vim /etc/rsyslog.d/50-default.conf

mail.*                          -/dev/null

"protocol imap {
  mail_plugins = autocreate
}
plugin {
  autocreate = Trash
  autocreate2 = Spam
  #autocreate3 = ..etc..
  autosubscribe = Trash
  autosubscribe2 = Spam
  #autosubscribe3 = ..etc..
}
"

服务器使用 SpamAssassin 防治垃圾邮件

SpamAssassin 是免費的垃圾郵件篩選器 SpamAssassin 是一个邮件过滤器，它部署在邮件服务器端，可以使用一系列的机制来确认垃圾邮件，这些机制包括：文本分析、Bayesian （贝叶斯判决规则）过滤、DNS 数据块列表，以及合作性的过滤数据库。 SpamAssassin 包括 spamd 守护进程和 spamc 客户端。

Headeranalysis (标题分析)：检查疑似垃圾邮件的标题，有些垃圾邮件被人采用某种技巧处理后，可能会被误认为是合法的电子邮件。
Text analysis (文本分析)：检查电子邮件正文中的垃圾邮件特征。
Blacklists (黑名单)：检查名单，看看发件人是否在现有垃圾邮件发送者列表中。
Database (数据库)：检查针对 Vipul's Razor (razor.sourceforge.net) 的邮件签名，它是一个垃圾邮件跟踪数据库。

sample-nonspam.txt.gz

shell> echo "hi there" | spamc

 X-Spam-Checker-Version: SpamAssassin 3.3.2-r929478 (2010-03-31) on sobell.com 
 X-Spam-Flag: YES 
 X-Spam-Level: ****** 
 X-Spam-Status: Yes, score=6.9 required=5.0 tests=EMPTY_MESSAGE,MISSING_DATE, 
 MISSING_HEADERS,MISSING_MID,MISSING_SUBJECT,NO_HEADERS_MESSAGE,NO_RECEIVED, 
 NO_RELAYS autolearn=no version=3.3.2-r929478 
 X-Spam-Report: 
 * -0.0 NO_RELAYS Informational: message was not relayed via SMTP 
 * 1.2 MISSING_HEADERS Missing To: header 
 * 0.1 MISSING_MID Missing Message-Id: header 
 * 1.8 MISSING_SUBJECT Missing Subject: header 
 * 2.3 EMPTY_MESSAGE Message appears to have no textual parts and no 
 * Subject: text 
 * -0.0 NO_RECEIVED Informational: message has no Received headers 
 * 1.4 MISSING_DATE Missing Date: header 
 * 0.0 NO_HEADERS_MESSAGE Message appears to be missing most RFC-822 
 * headers 
 hi there 
 Subject: [SPAM] 
 X-Spam-Prev-Subject: (nonexistent)

shell> spamassassin --help

shell> spamassassin --test-mode < /usr/share/doc/spamassassin/examples/sample-nonspam.txt
shell> spamassassin --test-mode < /usr/share/doc/spamassassin/examples/sample-spam.txt

shell> mail -s "mail-tester" [email protected] < /usr/share/doc/spamassassin/examples/sample-nonspam.txt
shell> mail -s "mail-tester" [email protected] < /usr/share/doc/spamassassin/examples/sample-spam.txt

shell> spamc -R < /usr/share/doc/spamassassin/examples/sample-spam.txt

shell> sendmail root < /usr/share/doc/spamassassin/examples/sample-nonspam.txt
shell> sendmail root < /usr/share/doc/spamassassin/examples/sample-spam.txt

shell> sa-learn --clear
shell> sa-learn --showdots --spam /home/spam/Maildir/{cur,new}
shell> sa-learn --dump magic

$HOME/.procmailrc

MAILDIR=$HOME/Mail


:0 c
* ^X-Spam-Status: Yes
.\&V4NXPpD1TvY-/     # 垃圾郵件

.Junk/

參考網站：

mydomain.com.   3600    IN  TXT "v=spf1 mx mx:mydomain.com -all"
mydomain.com.   3600    IN  TXT "v=spf1 ip4:192.168.1.100 -all"

"+"    Pass
"-"    Fail
"~"    SoftFail
"?"    Neutral

"v=spf1 -all"
"v=spf1 a -all"
"v=spf1 a mx -all"
"v=spf1 +a +mx -all"

opendkim-genkey - DKIM filter key generation tool

shell> apt-get install opendkim-tools
shell> opendkim-genkey -r -D -d mydomain.com

參考網站：

mail-tester

/usr/bin/sa-update sa-update

shell> sa-update && /etc/init.d/spamassassin reload


shell> sa-update -D
Jul  3 12:10:40.526 [22759] dbg: logger: adding facilities: all
Jul  3 12:10:40.526 [22759] dbg: logger: logging level is DBG
Jul  3 12:10:40.526 [22759] dbg: generic: SpamAssassin version 3.3.1
Jul  3 12:10:40.526 [22759] dbg: generic: Perl 5.010001, PREFIX=/usr, DEF_RULES_DIR=/usr/share/spamassassin, LOCAL_RULES_DIR=/etc/spamassassin, LOCAL_STATE_DIR=/var/lib/spamassassin
Jul  3 12:10:40.526 [22759] dbg: config: timing enabled
Jul  3 12:10:40.527 [22759] dbg: config: score set 0 chosen.
Jul  3 12:10:40.531 [22759] dbg: dns: no ipv6
Jul  3 12:10:40.531 [22759] dbg: dns: is Net::DNS::Resolver available? yes
Jul  3 12:10:40.531 [22759] dbg: dns: Net::DNS version: 0.65
Jul  3 12:10:40.531 [22759] dbg: generic: sa-update version svn917659
Jul  3 12:10:40.531 [22759] dbg: generic: using update directory: /var/lib/spamassassin/3.003001
Jul  3 12:10:40.623 [22759] dbg: diag: perl platform: 5.010001 linux
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Digest::SHA1, version 2.12
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: HTML::Parser, version 3.64
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Net::DNS, version 0.65
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: NetAddr::IP, version 4.024
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Time::HiRes, version 1.9719
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Archive::Tar, version 1.52
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: IO::Zlib, version 1.09
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Digest::SHA1, version 2.12
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: MIME::Base64, version 3.08
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: DB_File, version 1.82
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Net::SMTP, version 2.31
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Mail::SPF, version v2.007
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module not installed: IP::Country::Fast ('require' failed)
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module not installed: Razor2::Client::Agent ('require' failed)
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module not installed: Net::Ident ('require' failed)
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: IO::Socket::INET6, version 2.54
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module not installed: IO::Socket::SSL ('require' failed)
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Compress::Zlib, version 2.02
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module not installed: Mail::DKIM ('require' failed)
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: DBI, version 1.609
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: Getopt::Long, version 2.38
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: LWP::UserAgent, version 5.834
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module installed: HTTP::Date, version 5.831
Jul  3 12:10:40.623 [22759] dbg: diag: [...] module not installed: Encode::Detect ('require' failed)
Jul  3 12:10:40.624 [22759] dbg: gpg: Searching for 'gpg'
Jul  3 12:10:40.624 [22759] dbg: util: current PATH is: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
Jul  3 12:10:40.624 [22759] dbg: util: executable for gpg was found at /usr/bin/gpg
Jul  3 12:10:40.624 [22759] dbg: gpg: found /usr/bin/gpg
Jul  3 12:10:40.624 [22759] dbg: gpg: release trusted key id list: 5E541DC959CB8BAC7C78DFDC4056A61A5244EC45 26C900A46DD40CD5AD24F6D7DEE01987265FA05B 0C2B1D7175B852C64B3CDC716C55397824F434CE
Jul  3 12:10:40.630 [22759] dbg: channel: attempting channel updates.spamassassin.org
Jul  3 12:10:40.630 [22759] dbg: channel: update directory /var/lib/spamassassin/3.003001/updates_spamassassin_org
Jul  3 12:10:40.631 [22759] dbg: channel: channel cf file /var/lib/spamassassin/3.003001/updates_spamassassin_org.cf
Jul  3 12:10:40.631 [22759] dbg: channel: channel pre file /var/lib/spamassassin/3.003001/updates_spamassassin_org.pre
Jul  3 12:10:40.631 [22759] dbg: channel: metadata version = 1799552
Jul  3 12:10:40.844 [22759] dbg: dns: 1.3.3.updates.spamassassin.org => 1799552, parsed as 1799552
Jul  3 12:10:40.844 [22759] dbg: channel: current version is 1799552, new version is 1799552, skipping channel
Jul  3 12:10:40.844 [22759] dbg: diag: updates complete, exiting with code 1
shell> /etc/init.d/spamassassin reload

/var/lib/spamassassin/3.003001/updates_spamassassin_org

參考網站：

https://spamassassin.apache.org/full/3.1.x/doc/sa-update.html

轉發 (Relay)

DNS 黑名單 (DNSBL)

DNSBL 是儲存網際網路`SMTP 主機記錄的資料庫，這些主機是已知的垃圾電子郵件來源或容許的第三者、開放式轉遞。

即時黑名單殺傷力很強，經常因誤攔合法信件頻率過高，遭致批評。因為大部分郵件伺服器軟體都支援RBL，當企業擁有的郵件伺服器IP或網域名稱被列入DNS的黑名單，企業寄送的任何信件，甚至SMTP連線，都可能被視為垃圾信行為，導致收件人無法收到信件。收到垃圾信，處理起來固然令人困擾，但是收件人無法順利接到信件，使得整個郵件系統形同停擺。

在黑名單榜上有名，除了歸咎於企業刻意主動發出大量信件，造成網路使用者的困擾外，被列入黑名單有時也可能是因為IT人員未注意伺服器的不當設定，例如Open Relay、Open Proxy，或是遭遇電腦病毒感染、網路入侵，在不知情的情況下發出大量垃圾信所致。

Open Relay 不限制信件轉發的來源就是Open Relay。發送垃圾郵件的人能利用網際網路上這些伺服器的Open Relay來傳送大批的訊息，以便偽裝真實的郵件來源進而隱藏自己的身分，讓無辜的企業成為「免費」、「匿名」傳送大量郵件的資源，增加無謂的郵件處理工作。

Open Proxy 代理伺服器 (Proxy Server) 可透過HTTP連接任意的TCP埠，如果不限制連線來源的TCP埠或服務對象範圍，可能會被濫用，例如連至郵件伺服器的25埠作為中繼站，建立SMTP或Telnet等服務傳送特定指令，即可發出大量垃圾信，甚至攻擊內部網路。

各種即時黑名單組織各自採取不同封鎖立場和做法，例如Spamhaus提供2種黑名單，SBL分別針對垃圾郵件來源和已知垃圾郵件運作記錄的發信人，XBL專攻非法用途，包括Proxy、蠕蟲和木馬等；而Composite Blocking List不收集Open Relay名單，站方立場不提供支援資料或證據檔案，你無法詢問被列入的原因。

解除封鎖最簡單的方法是從網頁上直接解除，但大部分都需要寫信通知RBL管理者。Spamhaus的移除程序中提到，他們希望用戶主動聯繫SBL的工作人員，解釋企業解決垃圾郵件濫發的方法，如果處理完成，他們才會從SBL裡移除。

參考網站：

alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases

canonical_maps = hash:/etc/postfix/canonical
check_recipient_access hash:/etc/postfix/recipient_access
check_sender_access hash:/etc/postfix/access

mynetworks = hash:/etc/postfix/network_table
mynetworks = cidr:/etc/postfix/network_table.cidr

postscreen_dnsbl_reply_map = texthash:/etc/postfix/dnsbl_reply

recipient_bcc_maps = hash:/etc/postfix/recipient_bcc
recipient_canonical_maps = hash:/etc/postfix/recipient_canonical
relay_recipient_maps = hash:/etc/postfix/relay_recipients
relocated_maps = hash:/etc/postfix/relocated

sender_canonical_maps = hash:/etc/postfix/sender_canonical
smtp_generic_maps = hash:/etc/postfix/generic
smtp_tls_policy_maps = hash:/etc/postfix/tls_policy


transport_maps = hash:/etc/postfix/transport

virtual_alias_maps = hash:/etc/postfix/virtual

alias_maps = hash:/etc/postfix/aliases            (local aliasing)
header_checks = regexp:/etc/postfix/header_checks (content filtering)
transport_maps = hash:/etc/postfix/transport      (routing table)
virtual_alias_maps = hash:/etc/postfix/virtual    (address rewriting)

/etc/postfix/network_table.cidr

192.168.1.1             OK
192.168.0.0/16          OK

shell> postmap -q [email protected] hash:/etc/postfix/virtual

參考網站：

Default user: admin Default password: secret

myserver.net.in.    3599    IN    TXT    "v=spf1 mx mx:ds1515.dyndns.info -all"

參考網站：

Mar 17 03:25:54 mail imapd: LOGIN, user=bob, ip=[::ffff:192.168.8.205], port=[64109], protocol=IMAP

mailbox_command = /usr/bin/maildrop -d ${USER}

/etc/letsencrypt/live/mail.example.com

.
├── cert.pem -> ../../archive/mail.example.com/cert1.pem
├── chain.pem -> ../../archive/mail.example.com/chain1.pem
├── fullchain.pem -> ../../archive/mail.example.com/fullchain1.pem
├── privkey.pem -> ../../archive/mail.example.com/privkey1.pem
└── README

0 directories, 5 files

shell> postconf -e 'smtpd_use_tls = yes'
shell> postconf -e 'smtpd_tls_auth_only = yes'
shell> postconf -e 'smtpd_tls_cert_file = /etc/letsencrypt/live/mail.example.com/fullchain.pem'
shell> postconf -e 'smtpd_tls_key_file = /etc/letsencrypt/live/mail.example.com/privkey.pem'
shell> postconf -e 'tls_random_source = dev:/dev/urandom'
shell> postconf -e 'smtpd_tls_received_header = yes'
shell> postconf -e 'smtp_use_tls = yes'
shell> postconf -e 'smtp_tls_note_starttls_offer = yes'

shell> openssl req -new -newkey rsa:2048 -nodes -out server.csr -keyout server.key -subj "/C=TW/ST=Taiwan/L=Taipei/O=Microsoft Corp./CN=*.example.com"

shell> cat www_yourdomain_com.crt COMODORSADomainValidationSecureServerCA.crt COMODORSAAddTrustCA.crt > ssl-bundle.crt

smtpd_use_tls = yes
smtpd_tls_security_level = may
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/postfix/ssl/cert.pem
smtpd_tls_key_file = /etc/postfix/ssl/key.pem
smtpd_tls_CAfile = /etc/postfix/ssl/ssl-bundle.crt
smtpd_tls_session_cache_database = btree:/var/run/smtpd_tls_session_cache
smtpd_tls_received_header = yes
smtpd_tls_mandatory_ciphers = medium
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
smtpd_tls_protocols = !SSLv2, !SSLv3
smtpd_tls_exclude_ciphers = EXP, MEDIUM, LOW, DES, 3DES, SSLv2
smtpd_tls_ciphers = high
smtpd_tls_loglevel = 1
smtpd_tls_session_cache_timeout = 3600s
smtpd_tls_dh1024_param_file = /etc/postfix/ssl/postfix.dh.param

tls_random_source = dev:/dev/urandom
tls_high_cipherlist = kEECDH:+kEECDH+SHA:kEDH:+kEDH+SHA:+kEDH+CAMELLIA:kECDH:+kECDH+SHA:kRSA:+kRSA+SHA:+kRSA+CAMELLIA:!aNULL:!eNULL:!SSLv2:!RC4:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES
tls_medium_cipherlist = kEECDH:+kEECDH+SHA:kEDH:+kEDH+SHA:+kEDH+CAMELLIA:kECDH:+kECDH+SHA:kRSA:+kRSA+SHA:+kRSA+CAMELLIA:!aNULL:!eNULL:!SSLv2:!MD5:!DES:!EXP:!SEED:!IDEA:!3DES

smtp_tls_session_cache_database = btree:/var/run/smtp_tls_session_cache

smtp_use_tls = yes
smtp_tls_mandatory_protocols = !SSLv2, !SSLv3
smtp_tls_protocols = !SSLv2, !SSLv3
smtp_tls_exclude_ciphers = EXP, MEDIUM, LOW, DES, 3DES, SSLv2
smtp_tls_ciphers = high

參考網站：

shell> cat /etc/letsencrypt/live/mail.example.com/cert.pem /etc/letsencrypt/live/mail.example.com/chain.pem /etc/letsencrypt/live/mail.example.com/privkey.pem > combined.pem

shell> cat /etc/letsencrypt/live/mail.example.com/privkey.pem /etc/letsencrypt/live/mail.example.com/cert.pem > /etc/courier/imapd.pem
shell> openssl dhparam 2048 >> /etc/courier/imapd.pem

/etc/courier/imapd-ssl

SSLADDRESS=0.0.0.0

TLS_CERTFILE=/etc/courier/imapd.pem
TLS_CERTFILE=/etc/courier/combined.pem

courier-imap-ssl 993

shell> service courier-imap-ssl restart

/var/lib/amavis /var/lib/amavis/virusmails

pflogsumm - Postfix log entry summarizer

shell> apt-get install pflogsumm
shell> pflogsumm -d yesterday /var/log/maillog
shell> pflogsumm -d today /var/log/maillog

postfix-cluebringer - anti-spam plugin for Postfix

50-user

$final_spam_destiny       = D_PASS;
$sa_spam_subject_tag = undef;

$final_virus_destiny      = D_DISCARD; # (defaults to D_BOUNCE)
$final_banned_destiny     = D_DISCARD;  # (defaults to D_BOUNCE)
$final_spam_destiny       = D_DISCARD;  # (defaults to D_REJECT)
$final_bad_header_destiny = D_PASS;  # (defaults to D_PASS), D_BOUNCE suggested

$HOME/.mailfilter
/etc/courier/maildroprc
$HOME/.mailfilters

參考網站：

$HOME/.mailfilter

logfile maildrop.txt

if ( /^From: [email protected]/ )
{
  to "./Maildir/.Junk/."
}

if ( /^Subject:\s*test.*/ )
{
  to "./Maildir/.Trash/."
}

if ( /^To:\s*(.*)/ && lookup( $MATCH1, "badto.dat" ))

X-Spam-Flag: NO
X-Spam-Score: 5.18
X-Spam-Level: *****
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