这次我们来学习Linux系统中的Sendmail服务器的配置。（邮件服务器的IP192.168.1.2 主机域名为mail.ltest.com）

前提：首先我们 把DNS服务器安装OK 能够解析，不明白的看http://www.cublog.cn/u/21675/showart_263507.html

1，首先安装Sendmail所需软件

[root@localhost ~]# rpm -q sendmail m4

sendmail-8.13.1-2

m4-1.4.1-16 已经默认安装了，还需挂载第4张光盘，安装与sendmail相关的软件

[root@localhost RPMS]# rpm -ivh sendmail-*

warning: sendmail-cf-8.13.1-2.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e

Preparing... ########################################### [100%]

1:sendmail-doc ########################################### [ 33%]

2:sendmail-cf ########################################### [ 67%]

3:sendmail-devel ########################################### [100%]

2．修改/etc/mail/local-hosts-name文件。

增加本地域和主机的FQDN，记住只是本地主机的FQDN和域名FQDN，不要添加其他域的，否则向外域发送邮件的时候会出现user unknown的错误：

[root@localhost named]# cat /etc/mail/local-host-names

# local-host-names - include all aliases for your machine here.

ltest.com

3, 更改/etc/mail/sendmail.mc文件，修改下列地方：

DaemonPortsOptions=Port=smtp,Addr=127.0.0.1, Name=MTA 更改为：

DaemonPortsOptions=Port=smtp,Addr=yourip或者0.0.0.0, Name=MTA

然后m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf

4, 用户管理

认证的配置：修改/etc/mail/sendmail.mc中的字段，取消“TRUST_AUTH_MECH”一行和下一行“define”处的注释。（于sendmail.mc文件的第48、49）然后m4 /etc/ mail/sendmail.mc>/etc/mail/sendmail.cf。

[root@localhost named]# chkconfig --list saslauthd 开启认证

saslauthd 0:off 1:off 2:off 3:off 4:off 5:off 6:off

[root@localhost named]# chkconfig --level 35 saslauthd on

建立用户帐号

[root@localhost named]# groupadd mailuser

[root@localhost named]# adduser -g mailuser -s /sbin/nologin mike

[root@localhost named]# adduser -g mailuser -s /sbin/nologin john

[root@localhost named]# passwd mike

[root@localhost named]# passwd john 密码都是123

设置邮件别名和邮件群发

修改/etc/aliases文件实现邮件转发和邮件列表：

admin: mike 为邮件用户mike设置别名admin

testgroup: mike,john 实现群发 发给testgroup的邮件发给mike 和 john 以上2个可以分别测试

#newaliases

5，访问控制设置

更改/etc/mail/accesss文件，增加：

[root@localhost named]# cat /etc/mail/access

# Check the /usr/share/doc/sendmail/README.cf file for a description

# of the format of this file. (search for access_db in that file)

# The /usr/share/doc/sendmail/README.cf is part of the sendmail-doc

# package.

#

# by default we allow relaying from localhost...

localhost.localdomain RELAY

localhost RELAY

127.0.0.1 RELAY

ltest.com RELAY

完成后makemap hash /etc/mail/access.db < /etc/mail/access进行数据库更新。

6，#service sendmail restart

[root@localhost named]# service sendmail restart 启动服务

Shutting down sendmail: [FAILED]

Starting sendmail: [ OK ]

Starting sm-client: [ OK ]

[root@localhost named]# telnet localhost 25

Trying 127.0.0.1...

Connected to localhost.localdomain (127.0.0.1).

Escape character is '^]'.

220 localhost.localdomain ESMTP Sendmail 8.13.1/8.13.1; Sat, 17 Mar 2007 12:54:47 0800

ehlo localhost

250-localhost.localdomain Hello localhost.localdomain [127.0.0.1], pleased to meet you

250-ENHANCEDSTATUSCODES

250-PIPELINING

250-8BITMIME

250-SIZE

250-DSN

250-ETRN

250-AUTH DIGEST-MD5 CRAM-MD5 LOGIN PLAIN ---认证应该生效

250-DELIVERBY

250 HELP

quit

221 2.0.0 localhost.localdomain closing connection

Connection closed by foreign host.

7，安装邮局服务

[root@localhost RPMS]# rpm -ivh dovecot-0.99.11-2.EL4.1.i386.rpm --aid

warning: dovecot-0.99.11-2.EL4.1.i386.rpm: V3 DSA signature: NOKEY, key ID db42a60e

Preparing... ########################################### [100%]

1:perl-DBI ########################################### [ 20%]

2:postgresql-libs ########################################### [ 40%]

3:mysql ########################################### [ 60%]

4:dovecot ########################################### [ 80%]

5:perl-DBD-MySQL ########################################### [100%]

把1-5这些软件都安装完毕才可以继续下去呢，，，，

[root@localhost /]# vi /etc/dovecot.conf在protocols = imap imaps 后添加pop3 pop3s

启动dovecot服务

[root@localhost /]# service dovecot restart

Stopping Dovecot Imap: [FAILED]

Starting Dovecot Imap: [ OK ]

[root@localhost /]# chkconfig --level 35 dovecot on

OK了 我们使用客户机测试。