CentOS6.5上简易搭建Postfix、Dovecot、Sasl、OPenwebmail局域网邮件服务器以及DNS服务器

本文链接：https://blog.youkuaiyun.com/foxpermission/article/details/48222733

本教程详细介绍了如何在CentOS6.5环境下搭建邮局服务器，包括停用Sendmail、安装Apache、设置DNS服务器、配置Postfix、Dovecot、Saslauthd以及Openwebmail。通过这些步骤，您可以创建一个用于局域网的邮件服务，并使用Openwebmail进行访问。确保DNS设置正确，以便邮件服务和其他功能正常运行。

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环境：VMware11中CentOS6.5 64位 IP地址为192.168.45.128 子网掩码：255.255.255.0，网卡为NAT模式

创建一个普通用户（也就是openwebmail登录用户）

useradd abc

passwd abc

输入两次密码

安装之前检查是否装有Sendmail

Sendmail是默认安装的，停用或者卸载掉。（6.0之后postfix为default）

# chkconfig sendmail off //chkconfig命令主要用来更新（启动或停止）和查询系统服务的运行级信息。

# yum remove sendmail //此命令会remove掉mutt，mutt作为测试工具最好装上。

之后安装apache

# yum -y install httpd

# chkconfig httpd on

# service httpd restart

第一步要先搭建DNS服务器：

修改主机名称：

# vi /etc/hosts

192.168.1.15 mail.test.com //mailserver的domain将是test.com

保存之后安装相关软件

#yum install bind*

BIND配置文件保存在：
/etc/named.conf 主配置文件
/var/named/ 域zone文件位置

#vi /etc/named.conf

修改下面红色位置的内容

// See /usr/share/doc/bind*/sample/ for example named configuration files.
//

options {
listen-on port 53 { any; };
listen-on-v6 port 53 { ::1; };
directory "/var/named";
dump-file "/var/named/data/cache_dump.db";
statistics-file "/var/named/data/named_stats.txt";
memstatistics-file "/var/named/data/named_mem_stats.txt";
allow-query { any; };
recursion yes;

dnssec-enable yes;
dnssec-validation yes;
dnssec-lookaside auto;

/* Path to ISC DLV key */
bindkeys-file "/etc/named.iscdlv.key";

managed-keys-directory "/var/named/dynamic";
};

在结尾处追加如下红色内容：

logging {
channel default_debug {
file "data/named.run";
severity dynamic;
};
};

zone "test.com" IN {
type master;
file "test.com";
allow-update{none;};
};

zone "45.168.192.in-addr.arpa" IN {
type master;
file "45.168.192.local";
allow-update{none;};
};

zone "." IN {
type hint;
file "named.ca";
};

include "/etc/named.rfc1912.zones";
include "/etc/named.root.key";

保存退出文件。

配置正向解析

#cd /var/named/

#cp named.localhost test.com

#vim test.com

修改为如下内容，注意结尾的.

$TTL 86400
@ IN SOA dns.test.com. root.test.com. (
42 ; serial
3H ; refresh
15M ; retry
1W ; expire
1D ) ; minimum
IN NS dns.test.com.
IN MX 10 dns.test.com.
dns IN A 192.168.45.128
mail IN CNAME dns
pop3 IN CNAME dns
smtp IN CNAME dns
imap4 IN CNAME dns

配置反向解析

#cd /var/named/

#cp named.localhost 45.168.192.local

#vi 45.168.192.local

$TTL 86400
@ IN SOA dns.test.com. root.test.com. (
1997022700 ; serial
28800 ; refresh
14400 ; retry
3600000 ; expire
86400) ; minimum
IN NS dns.test.com.
128 IN PTR dns.test.com.

#chmod +r /var/named/* //让刚新建的文件具有读取权限

# service named restart

# chkconfig named on

启动named无报错的话，来测试一下dns

# netstat -tnl | grep 53 //确定named起来

#vi /etc/resolv.conf //修改本机的DNS服务器指向，修改红色部分

# Generated by NetworkManager
domain localdomain
search test.com
nameserver 192.168.45.128

# service network restart //重启network服务，但有时修改后resolv的内容会丢失，这时可以不用这句话，再次修改上述文件即可。

测试DNS是否工作正常

安装openwebmail

$ su -
# cd /etc/yum.repos.d
# wget -q http://openwebmail.org/openwebmail/download/redhat/rpm/release/openwebmail.repo
# yum install openwebmail

安装dovecot

#yum install dovecot

修改dovecot配置文件

#vim /etc/dovecot/dovecot.conf //取消下述两行内容前面的#号

protocols = imap imaps pop3 pop3s

listen = *

# service dovecot restart

# chkconfig dovecot on

关闭防火墙

#service iptables stop

安装cyrus-sasl

# yum -y install cyrus-sasl

# chkconfig saslauthd on

修改 /etc/sysconfig/saslauthd

# vim /etc/sysconfig/saslauthd

# Directory in which to place saslauthd's listening socket, pid file, and so

# on. This directory must already exist.

SOCKETDIR=/var/run/saslauthd

# Mechanism to use when checking passwords. Run "saslauthd -v" to get a list

# of which mechanism your installation was compiled with the ablity to use.

MECH=shadow

修改 /etc/sasl2/smtpd.conf

# vim /usr/lib/sasl2/smtpd.conf

pwcheck_method: saslauthd

mech_list: plain login

测试 saslauthd

# service saslauthd restart

# testsaslauthd -u abc -p '123'

0: OK "Success."

安装postfix

#yum install postfix

配置postfix

# vi /etc/postfix/main.cf

myhostname = mail.test.com
mydomain = test.com
myorigin = $mydomain
inet_interfaces = all //把 inet_interfaces = localhost 注释掉
inet_protocols = all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain
mynetworks = 0.0.0.0/0 //允许接收所有网段发来的邮件，根据情况自行修改
relay_domains = $mydestination

在文件最后追加
smtpd_banner = $myhostname ESMTP $mail_name ($mail_version
default_process_limit = 50
default_destination_concurrency_limit = 20
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain = $myhostname
smtpd_sasl_application_name = smtpd
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks,permit_sasl_authenticated,reject_unauth_destination
smtpd_client_restrictions = permit_sasl_authenticated

#service postfix restart

# chkconfig postfix on

测试postfix、dovecot端口

#netstat -altpn|grep 25

#netstat -altpn|grep 110

#netstat -altpn|grep 143

#netstat -altpn|grep 993

#netstat -altpn|grep 995

配置openwebmail

# vi /var/www/cgi-bin/openwebmail/etc/openwebmail.conf

domainnames test.com

default_language zh_CN.GB2312