二、sina.com配置：
把163.com主机配置，克隆一份，进行相应修改即可！
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注意：克隆前必须把电源关掉
如果sendmail启动比较慢，可以在1级别进行修改！（出现红色界面：按be末尾输入1）
1.手动配置ip
[root@mail ~]# vim /etc/sysconfig/network-scripts/ifcfg-eth0
[root@mail ~]# cat/etc/sysconfig/network-scripts/ifcfg-eth0
# Advanced Micro Devices [AMD] 79c970 [PCnet32 LANCE]
DEVICE=eth0
BOOTPROTO=none
ONBOOT=yes
HWADDR=00:0c:29:5b:98:33
NETMASK=255.255.255.0
IPADDR=192.168.10.9
TYPE=Ethernet
2.修改dns配置
[root@mail etc]# vim named.conf//5个any
[root@mail etc]# vim named.rfc1912.zones
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/13673620786481.png” border=”0″ alt=”” />
[root@mail named]# pwd
/var/named/chroot/var/named
[root@mail named]# cp -p 163.com.zone sina.com.zone
[root@mail named]# vim sina.com.zone
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dns指向
[root@mail ~]# vim /etc/resolv.conf
[root@mail ~]# cat /etc/resolv.conf
search domain.org
nameserver 192.168.10.9
3.修改主机名
[root@mail ~]# vim /etc/sysconfig/network
[root@mail ~]# cat /etc/sysconfig/network
NETWORKING=yes
NETWORKING_IPV6=yes
HOSTNAME=mail.sina.com
[root@mail ~]# hostname
mail.163.com//发现名字并没有改变过来
需要重启，如果不想重启，只需重命名后，重新登录即可！
[root@mail ~]# hostname mail.sina.com//重命名
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4.修改sendmail配置
[root@mail mail]# vim sendmail.mc
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/13673620800344.png” border=”0″ alt=”” />
116行，任意地址都可以telnet上该主机的25端口
[root@mail mail]# vim access
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/13673620807745.png” border=”0″ alt=”” />
sendmail服务重启
[root@mail ~]# service sendmail status
sendmail is stopped
[root@mail ~]# service sendmail restart
Shutting down sendmail:[FAILED]
Starting sendmail:[OK]
Starting sm-client:[OK]
5.查看接收服务器端口：
[root@mail ~]# netstat -tupln |grep dovecot
tcp00 :::993:::*LISTEN3166/dovecot
tcp00 :::995:::*LISTEN3166/dovecot
tcp00 :::110:::*LISTEN3166/dovecot
tcp00 :::143:::*LISTEN3166/dovecot
You have mail in /var/spool/mail/root
6.查看账号：
[root@mail ~]# tail /etc/passwd
nfsnobody:x:65534:65534:Anonymous NFS User:/var/lib/nfs:/sbin/nologin
sshd:x:74:74:Privilege-separated SSH:/var/empty/sshd:/sbin/nologin
haldaemon:x:68:68:HAL daemon:/:/sbin/nologin
gdm:x:42:42::/var/gdm:/sbin/nologin
avahi-autoipd:x:100:103:avahi-autoipd:/var/lib/avahi-autoipd:/sbin/nologin
sabayon:x:86:86:Sabayon user:/home/sabayon:/sbin/nologin
named:x:25:25:Named:/var/named:/sbin/nologin
user1:x:500:500::/home/user1:/bin/bash
user2:x:501:501::/home/user2:/bin/bash
dovecot:x:97:97:dovecot:/usr/libexec/dovecot:/sbin/nologin
彻底删除这两个帐号！
[root@mail ~]# userdel -r user1
[root@mail ~]# userdel -r user2
创建新账号：
[root@mail ~]# useradd user3
[root@mail ~]# passwd设置密码
Changing password for user root.
New UNIX password:
BAD PASSWORD: it is WAY too short
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
[root@mail ~]# useradd user4
[root@mail ~]# passwd
Changing password for user root.
New UNIX password:
BAD PASSWORD: it is WAY too short
Retype new UNIX password:
passwd: all authentication tokens updated successfully.
7.所有服务重启
重启sendmail named dovecot服务器
8.查看dns解析
dig –t mx sina.com
9.测试：
9.1windows下telnet上写信
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windows下收信:
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/13673620814217.png” border=”0″ alt=”” />
查看后退出时输入X信件还保留在邮箱中，输入q时，信件保留在家目录下的mbox里！
9.2 windows下使用客户端软件测试收发情况：
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/13673620816148.png” border=”0″ alt=”” />
创建了两个账号：user3、user4
点击“发送”
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/13673620819899.png” border=”0″ alt=”” />
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208249510.png” border=”0″ alt=”” />
：
三、163.com与sina.com如何通信？
[root@mail ~]# hostname
mail.163.com
[root@mail ~]# dig -t mx sina.com
; <<>> DiG9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> -t mx sina.com
;; global options:printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 57589
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION:
;sina.com.INMX
;; Query time: 28 msec
;; SERVER: 192.168.10.99#53(192.168.10.99)
;; WHEN: Sat Aug
;; MSG SIZErcvd: 26
sina.com找不到！
由于是内部邮件服务器，不是internet网上的，所以，只能转发：
163.com和sina.com都这样做
[root@mail ~]# vim /var/named/chroot/etc/named.conf
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208269111.png” border=”0″ alt=”” />
[root@mail ~]# rndc reload
server reload successful
在163.com下解析sina.com
[root@mail ~]# hostname
mail.163.com
[root@mail ~]# dig -t mx sina.com
; <<>> DiG9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> -t mx sina.com
;; global options:printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 54345
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2
;; QUESTION SECTION:
;sina.com.INMX
;; ANSWER SECTION:
sina.com.86388INMX10 mail.sina.com.
;; AUTHORITY SECTION:
sina.com.86388INNSns.sina.com.
;; ADDITIONAL SECTION:
mail.sina.com.86388INA192.168.10.9
ns.sina.com.86388INA192.168.10.9
;; Query time: 10 msec
;; SERVER: 192.168.10.99#53(192.168.10.99)
;; WHEN: Sat Aug4 12:11:58 2012
;; MSG SIZErcvd: 96
发信件，测试：
163.com启动sendmail服务！
[root@mail ~]# service sendmail status
sendmail is stopped
[root@mail ~]# service sendmail start
Starting sendmail:[OK]
Starting sm-client:[OK]
[root@mail ~]# netstat -tupln |grep 25
tcp000.0.0.0:250.0.0.0:*
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[root@mail ~]# tail -f /var/log/maillog//监控日志
Aug4 12:41:12 mail sendmail[3833]: q744fCNB003833: from=<user1@163.com>, size=1193, class=0, nrcpts=1, msgid=<598984A216F64770B9602B1F6073BCA7@PC201203120919>, proto=SMTP, daemon=MTA, relay=[192.168.10.1]
Aug4 12:41:52 mail sendmail[3837]: q744fCNB003833: to=<user4@sina.com>, ctladdr=<user1@163.com> (500/500), delay=00:00:40, xdelay=00:00:40, mailer=esmtp, pri=121193, relay=mail.sina.com. [192.168.10.9], dsn=2.0.0, stat=Sent (q744fTsd006212 Message accepted for delivery)
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208317813.png” border=”0″ alt=”” />
双方已能够正常通信，只是速度太慢
四、163.com与sina.com通信速度如何加快？
如果163.com向sina.com发送信件，sina要对163域名信息进行核实，所以，先正向解析，再反向解析，由于缺少反向解析，所以影响通信质量！
解决：配置反向DNS解析
修改163.com的区域文件：
[root@mail ~]# cd /var/named/chroot/etc/
[root@mail etc]# vim named.rfc1912.zones增加下面代码
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208408514.png” border=”0″ alt=”” />
[root@mail named]# cp -p named.local 192.168.10.zone
[root@mail named]# vim 192.168.10.zone
[root@mail named]# rndc reload
server reload successful
[root@mail named]# dig -x 192.168.10.99
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208423915.png” border=”0″ alt=”” />
; <<>> DiG9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> -x 192.168.10.99
;; global options:printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 23352
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2
;; QUESTION SECTION:
;99.10.168.192.in-addr.arpa.INPTR
;; ANSWER SECTION:
99.10.168.192.in-addr.arpa. 86400 INPTRmail.163.com.
;; AUTHORITY SECTION:
10.168.192.in-addr.arpa. 86400INNSlocalhost.
;; ADDITIONAL SECTION:
localhost.86400INA127.0.0.1
localhost.86400INAAAA::1
修改sina.com的区域文件：
[root@mail ~]# cd /var/named/chroot/etc/
[root@mail etc]# vim named.rfc1912.zones
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208439216.png” border=”0″ alt=”” />
[root@mail etc]# cd ../var/named/
[root@mail named]# cp -p named.local 192.168.10.local
[root@mail named]# vim 192.168.10.local
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208455917.png” border=”0″ alt=”” />
rndc reload//不用启动，只需加载更新项
[root@mail named]# dig -t mx 163.com//正向解析
; <<>> DiG9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> -t mx 163.com
;; global options:printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 14211
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2
;; QUESTION SECTION:
;163.com.INMX
;; ANSWER SECTION:
163.com.81604INMX10 mail.163.com.
;; AUTHORITY SECTION:
163.com.81523INNSns.163.com.
;; ADDITIONAL SECTION:
mail.163.com.81523INA192.168.10.99
ns.163.com.81523INA192.168.10.99
;; Query time: 5 msec
;; SERVER: 192.168.10.9#53(192.168.10.9)
;; WHEN: Sat Aug
;; MSG SIZErcvd: 95
[root@mail named]# dig -x 192.168.10.9//反向解析
; <<>> DiG9.3.6-P1-RedHat-9.3.6-4.P1.el5 <<>> -x 192.168.10.9
;; global options:printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 62534
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 2
;; QUESTION SECTION:
;9.10.168.192.in-addr.arpa.INPTR
;; ANSWER SECTION:
9.10.168.192.in-addr.arpa. 86400 INPTRmail.sina.com.
;; AUTHORITY SECTION:
10.168.192.in-addr.arpa. 86400INNSlocalhost.
;; ADDITIONAL SECTION:
localhost.86400INA127.0.0.1
localhost.86400INAAAA::1
;; Query time: 5 msec
;; SERVER: 192.168.10.9#53(192.168.10.9)
;; WHEN: Sat Aug
;; MSG SIZErcvd: 137
现在反向解析已存在，检测发送——接收信件之间是否加快！
650) this.width=650;” src=”http://cdn.verydemo.com/upload/2013_05_01/136736208482318.png” border=”0″ alt=”” />
一个背包，几本书，所有喜欢的歌，
