实现不同网段mail服务器之间的邮件转发

应题目要求 需要一台DNS服务器充当2个 mail服务器的域名解析服务器

1.设置DNS服务器  在DNS服务器上增加2块网卡 并分别设置IP地址。

设置主DNS配置文件.

vim /var/named/chroot/etc/named.conf

options {

      directory “/var/named”;

};

zone “hanfangzhou.com” {

      type master;

      file “hanfangzhou.com.zone”;

};

zone “laohu.com” {

      type master;

     file “laohu.com.zone”;

};

配置2个mail服务器的区域文件

vim /var/named/chroot/var/named/hanfangzhou.com.zone

@               IN SOA  @       root (

                                        42              ; serial (d. adams)

                                        3H              ; refresh

                                        15M             ; retry

                                        1W              ; expiry

                                        1D )            ; minimum

hanfangzhou.com.        IN NS           mail.hanfangzhou.com.

mail                    IN A            192.168.18.48

hanfangzhou.com.        IN MX 10        mail.hanfangzhou.com.

vim /var/named/chroot/var/named/laohu.com.zone

@               IN SOA  @       root (

                                        42              ; serial (d. adams)

                                        3H              ; refresh

                                        15M             ; retry

                                        1W              ; expiry

                                        1D )            ; minimum

laoyu.com.        IN NS            mail.laohu.com.

mail              IN A             10.1.1.2

laoyu.com.        IN MX 10         mail.laohu.com.

重启DNS服务

service named restart

开启网卡转发

 vim /etc/sysctl.conf

net.ipv4.ip_forward = 1

MAIL服务器1（mail.hanfangzhou.com）的设置

停止sendmail服务 关闭开机加载项 service sendmail stop  chkconfig sendmail off

安装postfix      yum install postfix -y

修改配置文件 vim /etc/postfix/main.cf

69 myhostname = mail.hanfangzhou.com

77 mydomain = hanfangzhou.com

93 myorigin = $mydomain

107 inet_interfaces = all

155 mydestination = $myhostname, localhost.$mydomain, localhost

255 mynetworks = 192.168.18.0/24, 127.0.0.0/8

287 relay_domains = hanfangzhou.com

保存退出

设置SMTP认证配置文件

vim /etc/sysconfig/saslauthd

   MECH=shadow

保存退出

service saslauthd restart

检查防火墙和SElinux是否关闭

验证 建立用户chaoyue

[root@hanfangzhou ~]# useradd chaoyue

[root@hanfangzhou ~]# passwd chaoyue

Changing password for user chaoyue.

New UNIX password:

BAD PASSWORD: it is WAY too short

Retype new UNIX password:

passwd: all authentication tokens updated successfully.

[root@hanfangzhou ~]# testsaslauthd -u chaoyue -p ‘123’

0: OK “Success.”

配置postfix服务与smtp关联

vim /etc/postfix/main.cf

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

保存退出

service postfix restart         chkconfig postfix on

验证

perl -MMIME::Base64 -e ‘print encode_base64(chaoyue);’

Y2hhb3l1ZQ==

perl -MMIME::Base64 -e ‘print encode_base64(123);’

MTIz

[root@hanfangzhou ~]# telnet mail.hanfangzhou.com 25

Trying 192.168.18.48…

Connected to mail.hanfangzhou.com (192.168.18.48).

Escape character is ‘^]’.

220 mail.hanfangzhou.com ESMTP Postfix

auth login

334 VXNlcm5hbWU6

Y2hhb3l1ZQ==

334 UGFzc3dvcmQ6

MTIz

235 2.0.0 Authentication successful

安装dovecot服务  yum install dovecot -y

修改配置文件

vim /etc/dovecot.conf

protocols = pop3 pop3s

 protocol pop3 {

     listen = *:10100

#     ..

   }

service dovecot restart    chkconfig dovecot on

安装cyrus

yum install cyrus-imapd cyrus-imapd-devel -y

修改postfix主配置文件  vim /etc/postfix/main.cf

修改 456行 去掉注释符 mailbox_transport = lmtp:unix:/var/lib/imap/socket/lmtp

service cyrus-imapd restart  chkconfig cyrus-imapd on

修改cyrus密码并建立chaoyue用户邮箱

[root@hanfangzhou ~]# passwd cyrus

Changing password for user cyrus.

New UNIX password:

BAD PASSWORD: it is WAY too short

Retype new UNIX password:

passwd: all authentication tokens updated successfully.

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

IMAP Password:

              localhost.localdomain> cm user.chaoyue

localhost.localdomain> cm user.chaoyue.Send

localhost.localdomain> cm user.chaoyue.Trash

localhost.localdomain> cm user.chaoyue.Drafts

安装 webmail  squirrelmail   yum install squirrelmail -y

设置 wenmail   /usr/share/squirrelmail/config/conf.pl

重启HTTPD服务

同理设置MAIL服务器2（mail.laohu.com）

测试