两台邮件服务器通过DNS解析互发邮件

原创

王小五2012 2013-01-12 22:42:33 博主文章分类：学习之前 ©著作权

文章标签 postfix DNS 邮件 文章分类 服务器

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题目：两个不同网段的邮件服务可以通过DNS解析互发邮件

DNS ：eth0 192.168.18.103

eth1 192.168.17.103

邮件服务器1： mail.vfast.com 192.168.18.104

邮件服务器2： mail.haha.com 192.168.17.106

DNS:

[root@localhost ~]# echo > 1 /proc/sys/net/ipv4/ip_forward

[root@localhost ~]# vim /etc/sysctl.conf

[root@localhost ~]# sysctl -p

net.ipv4.ip_forward = 1

net.ipv4.conf.default.rp_filter = 1

net.ipv4.conf.default.accept_source_route = 0

kernel.sysrq = 0

kernel.core_uses_pid = 1

net.ipv4.tcp_syncookies = 1

kernel.msgmnb = 65536

kernel.msgmax = 65536

kernel.shmmax = 4294967295

kernel.shmall = 268435456

[root@localhost ~]# service network restart

正在关闭接口 eth0： [确定]

正在关闭接口 eth1： [确定]

关闭环回接口： [确定]

禁用 IPv4 包转送： net.ipv4.ip_forward = 0

[确定]

弹出环回接口： [确定]

弹出界面 eth0： [确定]

弹出界面 eth1： [确定]

[root@localhost ~]# yum install bind*

[root@localhost ~]# vim /var/named/chroot/etc/named.conf

options {

directory "/var/named";

};

zone "vfast.com"{

type master;

file "vfast.com.zone";

};

zone "haha.com"{

type master;

file "haha.com.zone";

};

[root@localhost ~]# cp /usr/share/doc/bind-9.3.6/sample/var/named/localhost.zone /var/named/chroot/var/named/vfast.com.zone

[root@localhost ~]# vim /var/named/chroot/var/named/vfast.com.zone

$TTL 86400

@ IN SOA @ root (

42 ; serial (d. adams)

3H ; refresh

15M ; retry

1W ; expiry

1D ) ; minimum

vfast.com. IN NS mail.vfast.com.

mail.vfast.com. IN A 192.168.18.104

vfast.com. IN MX 10 mail.vfast.com.

haha.com. IN NS mail.haha.com.

mail.haha.com. IN A 192.168.17.106

mail.haha.com. IN MX 19 mail.haha.com.

[root@localhost ~]# cp /usr/share/doc/bind-9.3.6/sample/var/named/localhost.zone /var/named/chroot/var/named/haha.com.zone

[root@localhost ~]# vim /var/named/chroot/var/named/haha.com.zone

$TTL 86400

@ IN SOA @ root (

42 ; serial (d. adams)

3H ; refresh

15M ; retry

1W ; expiry

1D ) ; minimum

vfast.com. IN NS mail.vfast.com.

mail.vfast.com. IN A 192.168.18.104

vfast.com. IN MX 10 mail.vfast.com.

haha.com. IN NS mail.haha.com.

mail.haha.com. IN A 192.168.17.106

haha.com. IN MX 10 mail.haha.com.

[root@localhost ~]# echo "" > /etc/hosts

[root@localhost ~]# cat /etc/hosts

[root@localhost ~]# service named restart

停止 named： [确定]

启动 named： [确定]

[root@localhost ~]# echo "" > /etc/resolv.conf

[root@localhost ~]# host mail.vfast.com

mail.vfast.com has address 192.168.18.104

[root@localhost ~]# host mail.vfast.com

mail.vfast.com has address 192.168.18.104

邮件服务器1：

[root@localhost ~]# route add default gw 192.168.18.103

[root@localhost ~]# service network restart

正在关闭接口 eth0： [确定]

关闭环回接口： [确定]

弹出环回接口： [确定]

弹出界面 eth0： [确定]

[root@localhost ~]# service sendmail status

sendmail 已停

[root@localhost ~]# chkconfig sendmail off

[root@localhost ~]# vim /etc/resolv.conf

nameserver 192.168.18.103

[root@localhost ~]# rpm -qa | grep postfix

postfix-2.3.3-2.1.el5_2

[root@localhost ~]# vim /etc/postfix/main.cf

myhostname = mail.vfast.com

mydomain = vfast.com

myorigin = $mydomain

inet_interfaces = all

mydestination = $myhostname, $mydomain,

mynetworks = 192.168.18.0/24, 192.168.17.0/24, 127.0.0.0/8

relay_domains = vfast.com, haha.com

mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp

末尾加：

smtpd_sasl_auth_enable = yes

smtpd_sasl_local_domain = ''

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination

broken_sasl_auth_clients = yes

smtpd_client_restrictions = permit_sasl_authenticated

smtpd_sasl_security_options = noanonymous

[root@localhost ~]# service postfix restart

关闭 postfix： [失败]

启动 postfix： [确定]

安装dovecot：

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

修改配置文件：

[root@mail ~]# vim /etc/dovecot.conf

protocols = pop3 pop3s

protocol imap {

listen = *:10143

ssl_listen = *:10943

# ..

}

启动：

[root@mail ~]# /etc/init.d/dovecot start

启动 Dovecot Imap： [确定]

[root@localhost ~]# chkconfig dovecot on

[root@localhost ~]# yum install cyrus-imapd cyrus-imapd-devel -y

[root@localhost ~]# /etc/init.d/cyrus-imapd start

导入 cyrus-imapd 数据库： [确定]

启动 cyrus-imapd： [确定]

[root@localhost ~]# chkconfig cyrus-imapd on

[root@localhost ~]# service postfix restart

关闭 postfix： [确定]

启动 postfix： [确定]

[root@localhost ~]# telnet mail.haha.com 25

Trying 192.168.17.106...

Connected to mail.haha.com (192.168.17.106).

Escape character is '^]'.

220 mail.haha.com ESMTP Postfix

ehlo mail.haha.com

250-mail.haha.com

250-PIPELINING

250-SIZE 10240000

250-VRFY

250-ETRN

250-AUTH PLAIN LOGIN

250-AUTH=PLAIN LOGIN

250-ENHANCEDSTATUSCODES

250-8BITMIME

250 DSN

telnet> quit

Connection closed.

[root@localhost ~]# vim /etc/sysconfig/saslauthd

MECH=shadow

[root@localhost ~]# service saslauthd restart

停止 saslauthd： [失败]

启动 saslauthd： [确定]

[root@localhost ~]# chkconfig saslauthd on

[root@localhost ~]# useradd abc

[root@localhost ~]# passwd abc

Changing password for user abc.

New UNIX password:

BAD PASSWORD: it is WAY too short

Retype new UNIX password:

passwd: all authentication tokens updated successfully.

[root@localhost ~]# testsaslauthd -u abc -p "abc"

0: OK "Success."

[root@localhost ~]# service postfix restart

关闭 postfix： [确定]

启动 postfix： [确定]

[root@localhost ~]# cyradm -u cyrus localhost

IMAP Password:

localhost.localdomain> cm user.abc

localhost.localdomain> quit

[root@localhost ~]# yum install squirrelmail -y

[root@localhost ~]# /usr/share/squirrelmail/config/conf.pl

修改默认的IMAP服务：d--->cryus--->

修改服务器设置：2--->1（设置域名）--->vfast.com---->3(选择邮件类型)--->2(smtp)---->r(进入主菜单)----4（设置区分大小写）----->5---->---y----r(返回)--->10(修改字符编码)----->1--->zh_CN--->2----->gb2312---->s---->q

邮件服务器2：

[root@localhost ~]# route add default gw 192.168.17.103

[root@localhost ~]# service network restart

正在关闭接口 eth0： [确定]

关闭环回接口： [确定]

弹出环回接口： [确定]

弹出界面 eth0： [确定]

[root@localhost ~]# service sendmail status

sendmail 已停

[root@localhost ~]# chkconfig sendmail off

[root@localhost ~]# vim /etc/resolv.conf

nameserver 192.168.17.103

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

[root@localhost ~]# vim /etc/postfix/main.cf

myhostname = mail.haha.com

mydomain = haha.com

myorigin = $mydomain

inet_interfaces = all

mydestination = $myhostname, $mydomain,

mynetworks = 192.168.18.0/24, 192.168.17.0/24, 127.0.0.0/8

relay_domains = vfast.com, haha.com

mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp

smtpd_sasl_auth_enable = yes

smtpd_sasl_local_domain = ''

smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination

broken_sasl_auth_clients = yes

smtpd_client_restrictions = permit_sasl_authenticated

smtpd_sasl_security_options = noanonymous

安装dovecot：

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

修改配置文件：

[root@mail ~]# vim /etc/dovecot.conf

protocols = pop3 pop3s

protocol imap {

listen = *:10143

ssl_listen = *:10943

# ..

}

启动：

[root@mail ~]# /etc/init.d/dovecot start

启动 Dovecot Imap： [确定]

[root@localhost ~]# chkconfig dovecot on

[root@localhost ~]# yum install cyrus-imapd cyrus-imapd-devel -y

[root@localhost ~]# /etc/init.d/cyrus-imapd start

导入 cyrus-imapd 数据库： [确定]

启动 cyrus-imapd： [确定]

[root@localhost ~]# chkconfig cyrus-imapd on

[root@localhost ~]# service postfix restart

关闭 postfix： [确定]

启动 postfix： [确定]

[root@localhost ~]# telnet mail.haha.com 25

Trying 192.168.17.106...

Connected to mail.haha.com (192.168.17.106).

Escape character is '^]'.

220 mail.haha.com ESMTP Postfix

ehlo mail.haha.com

250-mail.haha.com

250-PIPELINING

250-SIZE 10240000

250-VRFY

250-ETRN

250-AUTH PLAIN LOGIN

250-AUTH=PLAIN LOGIN

250-ENHANCEDSTATUSCODES

250-8BITMIME

250 DSN

telnet> quit

Connection closed.

[root@localhost ~]# vim /etc/sysconfig/saslauthd

MECH=shadow

[root@localhost ~]# service saslauthd restart

停止 saslauthd： [失败]

启动 saslauthd： [确定]

[root@localhost ~]# chkconfig saslauthd on

[root@localhost ~]# useradd abc

[root@localhost ~]# passwd abc

Changing password for user abc.

New UNIX password:

BAD PASSWORD: it is WAY too short

Retype new UNIX password:

passwd: all authentication tokens updated successfully.

[root@localhost ~]# testsaslauthd -u abc -p "abc"

0: OK "Success."

[root@localhost ~]# service postfix restart

关闭 postfix： [确定]

启动 postfix： [确定]

[root@localhost ~]# cyradm -u cyrus localhost

IMAP Password:

localhost.localdomain> cm user.abc

localhost.localdomain> quit

[root@localhost ~]# yum install squirrelmail -y

[root@localhost ~]# /usr/share/squirrelmail/config/conf.pl

修改默认的IMAP服务：d--->cryus--->

测试：在邮件服务器1上，用abc@vfast.com给abc@haha.com发一封邮件，到邮件服务器2上查看，反之再回复一封，在查看

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