首先我們 把DNS服務器安裝OK 能夠解析，不明白的看linux.chinaitlab.com/server/725027.html">http://linux.chinaitlab.com/server/725027.html

1.首先安裝Sendmail所需軟件

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

sendmail-8.13.1-2

m4-1.4.1-16 已經默認安裝了，還需掛載第4張光盤，安裝與sendmail相關的軟件

[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。

增加本地域和主機的FQDN，記住只是本地主機的FQDN和域名FQDN，不要添加其他域的，否則向外域發送郵件的時候會出現user unknown的錯誤：

[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 更改為：

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.用戶管理

認證的配置：修改/etc/mail/sendmail.mc中的字段，取消“TRUST_AUTH_MECH”一行和下一行“define” 處的注釋。（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 開啟認證

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

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

建立用戶帳號

[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 密碼都是123

設置郵件別名和郵件群發

修改/etc/aliases文件實現郵件轉發和郵件列表：

admin: mike 為郵件用戶mike設置別名admin

testgroup: mike,john 實現群發 發給testgroup的郵件發給mike 和 john 以上2個可以分別測試

#newaliases

5.訪問控制設置

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進行數據庫更新。

6.#service sendmail restart

[root@localhost named]# service sendmail restart 啟動服務

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 ——認證應該生效

250-DELIVERBY

250 HELP

quit

221 2.0.0 localhost.localdomain closing connection

Connection closed by foreign host.

7.安裝郵局服務

[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這些軟件都安裝完畢才可以繼續下去呢，，，，

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

啟動dovecot服務

[root@localhost /]# service dovecot restart

Stopping Dovecot Imap: [FAILED]

Starting Dovecot Imap: [ OK ]

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