CentOS 7.2 部署邮件服务器（Postfix）

邮件服务器（Postfix）"/>

CentOS 7.2 部署邮件服务器（Postfix）

一、Postfix简介

• Postfix 是一种电子邮件服务器，它是由任职于IBM华生研究中心（T.J. Watson Research Center）的荷兰籍研究员Wietse Venema为了改良sendmail邮件服务器而产生的。最早在1990年代晚期出现，是一个开放源代码的软件。
• Postfix 官方网站：/
• Postfix 下载地址：.html

二、Postfix安装

• 安装Postfix以配置SMTP服务器

[1] 即使CentOS系统安装了[最小安装]，也会安装Postfix，但如果Postfix不安装，请先安装它，如下所示。

[root@linuxprobe ~]# yum -y install postfix

[2] 此示例显示配置SMTP-Auth以使用Dovecot的SASL函数。

[root@linuxprobe ~]# vi /etc/postfix/main.cf
# line 75: uncomment and specify hostnamemyhostname = linuxprobe.srv.world
# line 83: uncomment and specify domain namemydomain = srv.world
# line 99: uncommentmyorigin = $mydomain
# line 116: changeinet_interfaces = all
# line 164: addmydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
# line 264: uncomment and specify your local networkmynetworks = 127.0.0.0/8, 10.0.0.0/24
# line 419: uncomment (use mailboxdir)home_mailbox = mailbox/
# line 574: addsmtpd_banner = $myhostname ESMTP
# add follows to the end# limit an email size for 10Mmessage_size_limit = 10485760# limit a mailbox for 1Gmailbox_size_limit = 1073741824
# for SMTP-Authsmtpd_sasl_type = dovecot
smtpd_sasl_path = private/auth
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
smtpd_recipient_restrictions = permit_mynetworks,permit_auth_destination,permit_sasl_authenticated,reject[root@linuxprobe ~]# systemctl restart postfix
[root@linuxprobe ~]# systemctl enable postfix

[3]如果Firewalld正在运行，请允许SMTP服务。 SMTP使用25 / TCP。

[root@dlp ~]# firewall-cmd --add-service=smtp --permanent
success
[root@dlp ~]# firewall-cmd --reload
success 

三、Dovecot 安装

• 安装Dovecot以配置POP / IMAP服务器

[1] 安装Dovecot.

[root@linuxprobe ~]# yum -y install dovecot

[2] 此示例显示配置为向Postfix提供SASL功能 .

[root@linuxprobe ~]# vi /etc/dovecot/dovecot.conf
# line 24: uncomment
protocols = imap pop3 lmtp
# line 30: uncomment and change ( if not use IPv6 )
listen = *
[root@linuxprobe ~]# vi /etc/dovecot/conf.d/10-auth.conf
# line 10: uncomment and change ( allow plain text auth )
disable_plaintext_auth = no
# line 100: add
auth_mechanisms = plain login
[root@linuxprobe ~]# vi /etc/dovecot/conf.d/10-mail.conf
# line 30: uncomment and add
mail_location = maildir:~/Maildir
[root@linuxprobe ~]# vi /etc/dovecot/conf.d/10-master.conf
# line 96-98: uncomment and add like follows
# Postfix smtp-auth
unix_listener /var/spool/postfix/private/auth {mode = 0666user = postfixgroup = postfix
}
[root@linuxprobe ~]# vi /etc/dovecot/conf.d/10-ssl.conf
# line 8: change (not require SSL)
ssl = no[root@linuxprobe ~]# systemctl start dovecot
[root@linuxprobe ~]# systemctl enable dovecot

[3] 如果Firewalld正在运行，请允许POP / IMAP服务。 POP使用110 / TCP，IMAP使用143 / TCP.

[root@vdevops ~]# firewall-cmd --add-port={110/tcp,143/tcp} --permanent
success
[root@vdevops ~]# firewall-cmd --reload
success 

四、SSL设置

• 配置SSL以加密连接

[1] 首先创建证书，传送门：
[2] 为SSL配置Postfix和Dovecot。

# add to the end
smtpd_use_tls = yes
smtpd_tls_cert_file = /etc/pki/tls/certs/server.crt
smtpd_tls_key_file = /etc/pki/tls/certs/server.key
smtpd_tls_session_cache_database = btree:/etc/postfix/smtpd_scache
[root@linuxprobe ~]# vi /etc/postfix/master.cf
# line 26-28: uncomment
smtps       inet   n       -       n       -       -       smtpd-o syslog_name=postfix/smtps-o smtpd_tls_wrappermode=yes
[root@linuxprobe ~]# vi /etc/dovecot/conf.d/10-ssl.conf
# line 8: change
ssl = yes
# line 14,15: specify certificates
ssl_cert = </etc/pki/tls/certs/server.crt
ssl_key = </etc/pki/tls/certs/server.key
[root@linuxprobe ~]# systemctl restart postfix dovecot

[3] 如果Firewalld正在运行，请允许SMTPS / POP3S / IMAPS服务。 SMTPS使用465 /
TCP，POP3S使用995 / TCP，IMAPS使用993 / TCP。

[root@vdevops ~]# firewall-cmd --add-service={pop3s,imaps} --permanent
success
[root@vdevops ~]# firewall-cmd --add-port=465/tcp --permanent
success
[root@vdevops ~]# firewall-cmd --reload
success 

邮件日志报告：pflogsumm

• 安装pflogsumm这是Postfix日志报告工具

[1] 安装postfix-perl-scripts包 .

[root@linuxprobe ~]# yum -y install postfix-perl-scripts
# generate log summary for yesterday
[root@linuxprobe ~]# perl /usr/sbin/pflogsumm -d yesterday /var/log/maillog
Postfix log summaries for Jul 14
Grand Totals
------------
messages
      2   received
      5   delivered
      0   forwarded
      0   deferred
      0   bounced
      0   rejected (0%)
      0   reject warnings
      0   held
      0   discarded (0%)   2879   bytes received
   6572   bytes delivered
      1   senders
      1   sending hosts/domains
      2   recipients
      2   recipient hosts/domains
Per-Hour Traffic Summary
------------------------
    time          received  delivered   deferred    bounced     rejected
    --------------------------------------------------------------------
    0000-0100           0          0          0          0          0
    0100-0200           0          0          0          0          0
    0200-0300           0          0          0          0          0
    0300-0400           0          0          0          0          0
    0400-0500           0          0          0          0          0
    0500-0600           0          0          0          0          0
    0600-0700           0          0          0          0          0
    0700-0800           0          0          0          0          0
    0800-0900           0          0          0          0          0
    0900-1000           0          0          0          0          0
    1000-1100           2          5          0          0          0
    1100-1200           0          0          0          0          0
    1200-1300           0          0          0          0          0
    1300-1400           0          0          0          0          0
    1400-1500           0          0          0          0          0
    1500-1600           0          0          0          0          0
    1600-1700           0          0          0          0          0
    1700-1800           0          0          0          0          0
    1800-1900           0          0          0          0          0
    1900-2000           0          0          0          0          0
    2000-2100           0          0          0          0          0
    2100-2200           0          0          0          0          0
    2200-2300           0          0          0          0          0
    2300-2400           0          0          0          0          0Host/Domain Summary: Message Delivery
--------------------------------------
 sent cnt  bytes   defers   avg dly max dly host/domain
 -------- -------  -------  ------- ------- -----------
      3     4119        0     0.4 s    0.8 s  srv.world
      2     2453        0     0.1 s    0.1 s  mail.srv.worldHost/Domain Summary: Messages Received
---------------------------------------
 msg cnt   bytes   host/domain
 -------- -------  -----------
      2     2879   mail.srv.worldSenders by message count
------------------------
      2   cent@mail.srv.worldRecipients by message count
---------------------------
      3   redhat@srv.world
      2   cent@mail.srv.worldSenders by message size
-----------------------
   2879   cent@mail.srv.worldRecipients by message size
--------------------------
   4119   redhat@srv.world
   2453   cent@mail.srv.worldmessage deferral detail: none
message bounce detail (by relay): none
message reject detail: none
message reject warning detail: none
message hold detail: none
message discard detail: none
smtp delivery failures: none
Warnings
--------
  tlsmgr (total: 6)
         3   redirecting the request to postfix-owned data_directory /var/li...
         3   request to update table btree:/etc/postfix/smtpd_scache in non-...Fatal Errors: none
Panics: none
Master daemon messages
----------------------
      4   daemon started -- version 2.10.1, configuration /etc/postfix
      3   terminating on signal 15
      1   reload -- version 2.10.1, configuration /etc/postfix[root@linuxprobe ~]# crontab -e
# 发送邮件日志摘要在AM每天1:00到根
00 01 * * * perl /usr/sbin/pflogsumm -e -d yesterday /var/log/maillog | mail -s 'Logwatch for Postfix' root