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 hostname myhostname = linuxprobe.srv.world # line 83: uncomment and specify domain name mydomain = srv.world # line 99: uncomment myorigin = $mydomain # line 116: change inet_interfaces = all # line 164: add mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain # line 264: uncomment and specify your local network mynetworks = 127.0.0.0/8, 10.0.0.0/24 # line 419: uncomment (use mailboxdir) home_mailbox = mailbox/ # line 574: add smtpd_banner = $myhostname ESMTP # add follows to the end # limit an email size for 10M message_size_limit = 10485760 # limit a mailbox for 1G mailbox_size_limit = 1073741824 # for SMTP-Auth smtpd_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 = 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
