具体步骤如下：
1、使用rpm 命令是否有安装Sendmail 软件
mySuSE:~ # rpm -qa|grep sendmail
sendmail-devel-8.12.10-162.1
sendmail-8.12.10-162.1
mySuSE:~ #
若如上，则已经安装，若没有信息出来，则使用YAST 来进行安装，期间会提示插入相应安装盘
2、我这里已经安装，接下来 使用rpm 命令确认安装了imap
mySuSE:~ # rpm -qa|grep imap
php4-imap-4.3.4-43.8
imap-lib-2002e-92.1
imap-2002e-92.1
imap-devel-2002e-92.1
mySuSE:~#
若如上，则已经安装，若没有信息出来，则使用YAST 来进行安装，期间会提示插入相应安装盘
使用rpm 命令确认安装了pop
mySuSE:/etc/xinetd.d # rpm -qa|grep pop
popt-1.7-176.7
qpopper-4.0.5-175.1
mySuSE:~#
若如上，则已经安装，若没有信息出来，则使用YAST 来进行安装，期间会提示插入相应安装 盘
3、修改/etc/sysconfig/mail 这个配置文件，是本机以外的人可以使用该服务器EMAIL，如 下：
mySuSE:/etc/sysconfig # vi mail
## Path: Network/Mail/General
## Description:
## Type: string
## Default: ""
## Config: postfix
## ServiceReload: sendmail,postfix
#
# From:-Line in email and News postings
# (otherwise the FQDN is used)
#
FROM_HEADER=""
## Path: Network/Mail/General
## Description: General configuration of mail interface
## Type: yesno
## Default: yes
## Config: sendmail,postfix
#
# If you don't want to let SuSEconfig generate your
# configuration file, set this to no
#
MAIL_CREATE_CONFIG="yes"
## Type: yesno
## Default: no
## Config: postfix
#
# Set this to "yes" if mail from remote should be accepted
# this is necessary for any mail server.
# If set to "no" or empty then only mail from localhost
# will be accepted.
#
SMTPD_LISTEN_REMOTE="yes" ----原来是 no,一定要改成 yes 才能让其它外部 PC 使用该EMIAL服务器发邮件
4、修改Linux.mc 设定档，编辑/etc/mail/Linux.mc 文件
在83%处将：
dnl FEATURE(`authinfo', `hash -o 'AUTH_DIR`/auth-info')dnl
修改为：
FEATURE(`access_db', `hash -T -o /etc/mail/access.db')dnl
在86%处将：
dnl TRUST_AUTH_MECH(`place_here_your_auth_mechanism')dnl
dnl define(`confAUTH_MECHANISMS', `place_here_your_auth_mechanism')dnl
修改为：
TRUST_AUTH_MECH(`place_here_your_auth_mechanism')dnl
define(`confAUTH_MECHANISMS', `place_here_your_auth_mechanism')dnl
然后：
mySuSE:/etc/mail # m4 /etc/mail/linux.mc > /etc/sendmail.cf
生成可用的sendmail.cf
5、编辑/etc/sendmail.cf 文件，如下
在13%处，将：
# SMTP client options
#O ClientPortOptions=Family=inet, Address=0.0.0.0
修改为：
# SMTP client options
O ClientPortOptions=Family=inet, Address=10.38.223.195 ---本机的IP
6、编辑/etc/mail/local-host-names, 加入本机域名
# Format:
#
#<aliases for local host>
mail.sina.com
sina.com
7、编辑/etc/mail/access，加入
# Default for loop back is RELAY
127 RELAY
10.38.223 RELAY
允许10.38.223 地址段的邮件转发
然后：
mySuSE:/etc/mail # makemap hash /etc/mail/access.db < /etc/mail/access
将access 里的文件内容转化为/etc/mail/access.db 资料库
8、mySuSE:/etc/mail # chkconfig --level 35 sendmail on
mySuSE:/etc/mail #
在runlevel 3、5 级别下让sendmail 服务开机自动加载
9、查看/etc/services，确保：
smtp 25/tcp mail # Simple Mail Transfer
smtp 25/udp mail # Simple Mail Transfer
和
pop3 110/tcp # Post Office Protocol - Version 3
pop3 110/udp # Post Office Protocol - Version 3
前的#号没有被注释掉
10、编辑/etc/xinetd.d 下的imap 文件，修改如下：
# imap - imap mail daemon
#
service imap
{
disable = yes ---------修改为no
socket_type = stream
protocol = tcp
wait = no
user = root
server = /usr/sbin/imapd
flags = IPv4
}
编辑/etc/xinetd.d 下的qpopper 文件，修改如下：
# qpopper - pop3 mail daemon
#
service pop3
{
disable = yes ----------修改为no
socket_type = stream
protocol = tcp
wait = no
user = root
server = /usr/sbin/popper
server_args = -s
flags = IPv4
}
~
接着重新启动xinetd
mySuSE:/etc/init.d # ./xinetd restart
Shutting down xinetd: done
Starting INET services. (xinetd) done
mySuSE:/etc/init.d #
使用如下命令查看状态
mySuSE:/usr/sbin # ./ipop3d status
+OK POP3 mySuSE.js v2003.83 server ready
mySuSE:/usr/sbin # ./imapd status
* OK [CAPABILITY IMAP4REV1 LOGIN-REFERRALS STARTTLS LOGINDISABLED] mySuSE IMAP4rev1 2003.339 at Sun, 6 Jul 2008 14:30:06 -0700 (PDT)
11、最后重新启动Sendmail 服务
mySuSE:/etc/init.d # ./sendmail start
Initializing SMTP port (sendmail) done
mySuSE:/etc/init.d #
12、先本机测试：
mySuSE:~ # telnet 127.0.0.1 25
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
220 mySuSE ESMTP Sendmail 8.12.10/8.12.10/SuSE Linux 0.7; Sun, 6 Jul 2008 14:41:47 -0700
ehlo aa
250-mySuSE Hello localhost [127.0.0.1], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
quit
221 2.0.0 mySuSE closing connection
Connection closed by foreign host.
说明服务成功启动，并且本机可以使用
mySuSE:~ # telnet 10.38.223.195 25
Trying 10.38.223.195...
Connected to 10.38.223.195.
Escape character is '^]'.
220 mySuSE ESMTP Sendmail 8.12.10/8.12.10/SuSE Linux 0.7; Sun, 6 Jul 2008 14:42:35 -0700
ehlo bb
250-mySuSE Hello mySuSE.js [10.38.223.195], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
quit
221 2.0.0 mySuSE closing connection
Connection closed by foreign host.
说明其它PC 可以通过该IP 来使用EMAIL 服务
mySuSE:~ # telnet mail.sina.com 25
Trying 10.38.223.195...
Connected to mail.sina.com.
Escape character is '^]'.
220 mySuSE ESMTP Sendmail 8.12.10/8.12.10/SuSE Linux 0.7; Sun, 6 Jul 2008 14:43:41 -0700
ehlo cc
250-mySuSE Hello mySuSE.js [10.38.223.195], pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-DELIVERBY
250 HELP
quit
221 2.0.0 mySuSE closing connection
Connection closed by foreign host.
说明可以通过域名来使用
然后可以创建用户，使用WINDOWS 的outlook 客户端来做测试。
记住：一定要在/etc/hosts 里添加类似如下行
192.168.1.106 study.zzjtlxs.com study
可能需要從網上下載的rpm
ftp://rpmfind.net/linux/opensuse/update/11.0/rpm/i586/imap-2006c1_suse-100.3.i586.rpm
ftp://rpmfind.net/linux/opensuse/update/11.0/rpm/i586/imap-lib-2006c1_suse-100.3.i586.rpm
