CentOS 7.0 で Mail Server構築(Postfix+Dovecot)

[root@ufuso ~]# vi /etc/postfix/main.cf　←　Postfix設定ファイル編集
# INTERNET HOST AND DOMAIN NAMES
#
# The myhostname parameter specifies the internet hostname of this
# mail system. The default is to use the fully-qualified domain name
# from gethostname(). $myhostname is used as a default value for many
# other configuration parameters.
#
#myhostname = host.domain.tld
#myhostname = virtual.domain.tld
myhostname = ufuso.dip.jp　←　追加(自FQDN名を指定)

# The mydomain parameter specifies the local internet domain name.
# The default is to use $myhostname minus the first component.
# $mydomain is used as a default value for many other configuration
# parameters.
#
#mydomain = domain.tld
mydomain = ufuso.dip.jp　←　追加(自ドメイン名を指定)

# SENDING MAIL
#
# The myorigin parameter specifies the domain that locally-posted
# mail appears to come from. The default is to append $myhostname,
# which is fine for small sites.  If you run a domain with multiple
# machines, you should (1) change this to $mydomain and (2) set up
# a domain-wide alias database that aliases each user to
# user@that.users.mailhost.
#
# For the sake of consistency between sender and recipient addresses,
# myorigin also specifies the default domain name that is appended
# to recipient addresses that have no @domain part.
#
#myorigin = $myhostname
myorigin = $mydomain　←　行頭の#を削除。ローカルからのメール送信時の送信元メール
アドレス@以降にドメイン名を付加

# RECEIVING MAIL

# The inet_interfaces parameter specifies the network interface
# addresses that this mail system receives mail on.  By default,
# the software claims all active interfaces on the machine. The
# parameter also controls delivery of mail to user@[ip.address].
#
# See also the proxy_interfaces parameter, for network addresses that
# are forwarded to us via a proxy or network address translator.
#
# Note: you need to stop/start Postfix when this parameter changes.
#
inet_interfaces = all　←　行頭の#を削除(外部からのメール受信を許可)
#inet_interfaces = $myhostname
#inet_interfaces = $myhostname, localhostl
#inet_interfaces = localhost　←　行頭に#を付加

# STANDARD_CONFIGURATION_README).
#
# The local machine is always the final destination for mail addressed
# to user@[the.net.work.address] of an interface that the mail system
# receives mail on (see the inet_interfaces parameter).
#
# Specify a list of host or domain names, /file/name or type:table
# patterns, separated by commas and/or whitespace. A /file/name
# pattern is replaced by its contents; a type:table is matched when
# a name matches a lookup key (the right-hand side is ignored).
# Continue long lines by starting the next line with whitespace.
#
# See also below, section "REJECTING MAIL FOR UNKNOWN LOCAL USERS".
#
#mydestination = $myhostname, localhost.$mydomain, localhost
　←　行頭に#を付加して無効にする
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
　←　行頭の#を削除(自ドメイン宛メールを受信できるようにする)
#mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain,
#       mail.$mydomain, www.$mydomain, ftp.$mydomain

# DELIVERY TO MAILBOX
#
# The home_mailbox parameter specifies the optional pathname of a
# mailbox file relative to a user's home directory. The default
# mailbox file is /var/spool/mail/user or /var/mail/user.  Specify
# "Maildir/" for qmail-style delivery (the / is required).
#
#home_mailbox = Mailbox
home_mailbox = Maildir/　←　行頭の#を削除(メールボックス形式をMaildir形式にする)

# SHOW SOFTWARE VERSION OR NOT
#
# The smtpd_banner parameter specifies the text that follows the 220
# code in the SMTP server's greeting banner. Some people like to see
# the mail version advertised. By default, Postfix shows no version.
#
# You MUST specify $myhostname at the start of the text. That is an
# RFC requirement. Postfix itself does not care.
#
#smtpd_banner = $myhostname ESMTP $mail_name
#smtpd_banner = $myhostname ESMTP $mail_name ($mail_version)
smtpd_banner = $myhostname ESMTP unknown　←　追加(メールサーバーソフト名の隠蔽化)

以下を最終行へ追加(SMTP-Auth設定)

smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions =
    permit_mynetworks
    permit_sasl_authenticated
    reject_unauth_destination


[root@ufuso ~]# systemctl restart postfix　←　postfix再起動

[root@ufuso ~]# systemctl enable postfix　←　postfix自動起動設定

[root@ufuso ~]# systemctl start saslauthd　←　saslauthd起動

[root@ufuso ~]# systemctl enable saslauthd　←　saslauthd自動起動設定
ln -s '/usr/lib/systemd/system/saslauthd.service' '/etc/systemd/system/multi-user.target.wants/saslauthd.service'

[root@ufuso ~]# systemctl restart postfix　←　postfix再起動

saslauthdが入っていなければ yum install cyrus-sasl cyrus-sasl-plain

[root@ufuso ~]# yum -y install dovecot　←　Dovecotインストール
インストール:
  dovecot.x86_64 1:2.2.10-4.el7_0.1                                             

完了しました!

[root@ufuso ~]# vi /etc/dovecot/dovecot.conf　←　Dovecotの設定
# A comma separated list of IPs or hosts where to listen in for connections.
# "*" listens in all IPv4 interfaces, "::" listens in all IPv6 interfaces.
# If you want to specify non-default ports or anything more complex,
# edit conf.d/master.conf.
#listen = *, ::
listen = *　←　 追記。IPv6を無効化

[root@ufuso ~]#  vi /etc/dovecot/conf.d/10-auth.conf　←　認証の設定
# Disable LOGIN command and all other plaintext authentications unless
# SSL/TLS is used (LOGINDISABLED capability). Note that if the remote IP
# matches the local IP (ie. you're connecting from the same computer), the
# connection is considered secure and plaintext authentication is allowed.
# See also ssl=required setting.
#disable_plaintext_auth = yes
disable_plaintext_auth = no　←　追記。プレーンテキスト認証も許可

# Space separated list of wanted authentication mechanisms:
#   plain login digest-md5 cram-md5 ntlm rpa apop anonymous gssapi otp skey
#   gss-spnego
# NOTE: See also disable_plaintext_auth setting.
auth_mechanisms = plain login　←　ログイン認証も許可

[root@ufuso ~]# vi /etc/dovecot/conf.d/10-mail.conf　←　Dovecotの設定
# See doc/wiki/Variables.txt for full list. Some examples:
#
#   mail_location = maildir:~/Maildir
#   mail_location = mbox:~/mail:INBOX=/var/mail/%u
#   mail_location = mbox:/var/mail/%d/%1n/%n:INDEX=/var/indexes/%d/%1n/%n
#
# 
#
#mail_location =
mail_location = maildir:~/Maildir　←　メールボックス形式をMaildir形式に

[root@ufuso ~]# vi /etc/dovecot/conf.d/10-master.conf　←　Dovecotの設定
 # Postfix smtp-auth
  #unix_listener /var/spool/postfix/private/auth {
  #  mode = 0666
  #}
  unix_listener /var/spool/postfix/private/auth {
     mode = 0666
     user = postfix　←　追記
     group = postfix　←　追記
   }

[root@ufuso ~]# systemctl start dovecot　←　Dovecot起動

[root@ufuso ~]# systemctl enable dovecot　←　Dovecot自動起動設定
ln -s '/usr/lib/systemd/system/dovecot.service' '/etc/systemd/system/multi-user.target.wants/dovecot.service'

[root@ufuso ~]# vi /etc/postfix/main.cf　←　メイン設定の編集
# INTERNET OR INTRANET

# The relayhost parameter specifies the default host to send mail to
# when no entry is matched in the optional transport(5) table. When
# no relayhost is given, mail is routed directly to the destination.
#
# On an intranet, specify the organizational domain name. If your
# internal DNS uses no MX records, specify the name of the intranet
# gateway host instead.
#
# In the case of SMTP, specify a domain, host, host:port, [host]:port,
# [address] or [address]:port; the form [host] turns off MX lookups.
#
# If you're connected via UUCP, see also the default_transport parameter.
#
#relayhost = $mydomain
#relayhost = [gateway.my.domain]
#relayhost = [mailserver.isp.tld]
#relayhost = uucphost
#relayhost = [an.ip.add.ress]
relayhost = [auth.au-hikari.ne.jp]:587　←　プロバイダのSMTPサーバーを指定
以下を最終行へ追記
smtp_sasl_auth_enable = yes
smtp_sasl_password_maps = hash:/etc/postfix/authinfo
smtp_sasl_security_options = noanonymous
smtp_sasl_mechanism_filter = LOGIN

[root@ ~]# echo [auth.au-hikari.ne.jp]:587 ユーザー名@at.au-hikari.ne.jp:パスワード > /etc/postfix/authinfo
　←　SMTP認証情報設定
SMTPサーバー名・・・プロバイダのSMTPサーバー名
ユーザー名・・・プロバイダのメールアカウント名
@at.au-hikari.ne.jp・・・ご自分のメールアカウント名の@以降の部分
パスワード・・・プロバイダのメールパスワード

[root@ ~]# chmod 640 /etc/postfix/authinfo　←　root以外参照できないようにパーミッション変更

[root@ ~]# postmap /etc/postfix/authinfo　←　authinfo.db作成

[root@ ~]# systemctl restart postfix　←　Postfix設定反映