CentOS 7.2 部署邮件服务器（Postfix）

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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：http://www.postfix.org/
Postfix 下载地址：http://www.postfix.org/download.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 = dovecotsmtpd_sasl_path = private/authsmtpd_sasl_auth_enable = yessmtpd_sasl_security_options = noanonymoussmtpd_sasl_local_domain = $myhostnamesmtpd_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 --permanentsuccess[root@dlp ~]# firewall-cmd --reloadsuccess

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: uncommentprotocols = 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: addauth_mechanisms = plain login[root@linuxprobe ~]# vi /etc/dovecot/conf.d/10-mail.conf# line 30: uncomment and addmail_location = maildir:~/Maildir[root@linuxprobe ~]# vi /etc/dovecot/conf.d/10-master.conf# line 96-98: uncomment and add like follows# Postfix smtp-authunix_listener /var/spool/postfix/private/auth {    mode = 0666    user = postfix    group = 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} --permanentsuccess[root@vdevops ~]# firewall-cmd --reloadsuccess

四、SSL设置

配置SSL以加密连接

[1] 首先创建证书，传送门：http://blog.csdn.net/wh211212/article/details/52982917
[2] 为SSL配置Postfix和Dovecot。

# add to the endsmtpd_use_tls = yessmtpd_tls_cert_file = /etc/pki/tls/certs/server.crtsmtpd_tls_key_file = /etc/pki/tls/certs/server.keysmtpd_tls_session_cache_database = btree:/etc/postfix/smtpd_scache[root@linuxprobe ~]# vi /etc/postfix/master.cf# line 26-28: uncommentsmtps       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: changessl = yes# line 14,15: specify certificatesssl_cert = </etc/pki/tls/certs/server.crtssl_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} --permanentsuccess[root@vdevops ~]# firewall-cmd --add-port=465/tcp --permanentsuccess[root@vdevops ~]# firewall-cmd --reloadsuccess

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/maillogPostfix log summaries for Jul 14Grand 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/domainsPer-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: nonemessage bounce detail (by relay): nonemessage reject detail: nonemessage reject warning detail: nonemessage hold detail: nonemessage discard detail: nonesmtp delivery failures: noneWarnings--------  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: nonePanics: noneMaster 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

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