[root@myhost ~]# pacman -S bind postfix dovecot

[root@myhost named]# vi /etc/named.conf
#末行增加下面这段来添加主区域test.net
zone "test.net" IN {
        type master;
        file "test.net.zone";
};

[root@myhost ~]# vi /var/named/test.net.zone
$ORIGIN test.net.
@                       1D IN SOA       @ root (
                                        42              ; serial (yyyymmdd##)
                                        3H              ; refresh
                                        15M             ; retry
                                        1W              ; expiry
                                        1D )            ; minimum ttl

                        1D IN NS        @
                        1D IN A         192.168.252.77
mail                    1D IN A         192.168.252.77
@                       1D IN MX 10     mail
smtp                    1D IN CNAME     mail
pop3                    1D IN CNAME     mail
imap                    1D IN CNAME     mail

[root@myhost ~]# /etc/rc.d/named restart
[root@myhost ~]# host -t mx test.net
//如看到下面这段MX记录就已生效
test.net mail is handled by 10 mail.test.net.

[root@myhost ~]# vi /etc/postfix/main.cf
#修改相应参数为相应的值，或者直接增加到文件最后
#================base-config================
myhostname = mail.test.net
mydomain = test.net
myorigin = $mydomain  //如邮头中未注明网域名称，则自动补用此参数设置的值
mydestination = localhost, $mydomain  //此参数列出postfix应将其视为"本地网域"的所有网域名称
mynetworks = 127.0.0.0/8, 192.168.252.0/24  //明确指出哪些主机可以享受转发服务
inet_interfaces = all  //指定postfix系统监听的网络接口
mail_spool_directory = /var/spool/mail  //系统邮件存储目录
alias_maps = hash:/etc/postfix/aliases  //别名文件的路径，默认已经写好的

[root@myhost ~]# vi /etc/postfix/aliases
#默认已经写好一些的，我们只需在文件末增加一行
root:           admin

[root@myhost ~]# postfix check
[root@myhost ~]# postalias /etc/postfix/aliases
[root@myhost ~]# /etc/rc.d/postfix restart

[root@myhost ~]# ktelnet smtp.test.net 25
Trying 127.0.0.1...
Connected to localhost.localdomain.
Escape character is '^]'.
220 mail.test.net ESMTP Postfix
helo 000
250 mail.test.net
mail from:<user1@test.net>
250 2.1.0 Ok
rcpt to:<user2@test.net>
250 2.1.5 Ok
data
354 End data with <CR><LF>.<CR><LF>
hello,i am user1
.
250 2.0.0 Ok: queued as 6D1152D499
quit
221 2.0.0 Bye
Connection closed by foreign host.

[root@myhost ~]# cp /etc/dovecot/dovecot-example.conf /etc/dovecot/dovecot.conf
[root@myhost ~]# vi /etc/dovecot/dovecot.conf
#修改相应参数为相应的值
base_dir = /var/run/dovecot/
protocols = imap pop3
listen = *
disable_plaintext_auth = no
#如disable_plaintext_auth != no则登陆时报错Plaintext authentication disallowed on non-secure connections
ssl_disable = yes
#如ssl_disable != yes则启动服务时报错Can't use SSL certificate /etc/dovecot/ssl/certs/dovecot.pem: No such file or directory
mail_location = /var/spool/mail/%u  //服务器邮箱的统一位置，这个要和你在postfix中设置的符合
protocol imap {
}
protocol pop3 {
    pop3_uidl_format = %u
}
auth default {
    mechanisms = plain
    passdb pam {
        args = dovecot
    }
    userdb passwd {
    }
    user = root
}

[root@myhost ~]# vi /etc/pam.d/dovecot
auth            required        pam_unix.so
account         required        pam_unix.so
password        required        pam_unix.so
session         required        pam_unix.so

[root@myhost ~]# /etc/rc.d/dovecot restart

[root@myhost ~]# ktelnet pop3.test.net 110
Trying 192.168.252.77...
Connected to mail.test.net.
Escape character is '^]'.
+OK Dovecot ready.
user user2
+OK
pass 123456
+OK Logged in.
stat
+OK 1 426
retr 1
+OK 426 octets
Return-Path: <user1@test.net>
X-Original-To: user2@test.net
Delivered-To: user2@test.net
Received: from 000 (unknown [192.168.252.77])
  by mail.test.net (Postfix) with SMTP id 3C6EE2D499
  for <user2@test.net>; Sun, 28 Sep 2008 12:20:37 -0700 (PDT)
Message-Id: <20080928192046.3C6EE2D499@mail.test.net>
Date: Sun, 28 Sep 2008 12:20:37 -0700 (PDT)
From: user1@test.net
To: undisclosed-recipients:;

hello,i am user1
.
quit
+OK Logging out.
Connection closed by foreign host.