RedHat Linux 9.0 完全安装或者确保以下安装包已经安装完毕：
imap-2001a-18.i286.rpm
sendmail-8.12.8-4.i386.rpm
m4-1.4.1-13.i386.rpm
cyrus-sasl-2.1.10-4.i386.rpm
cyrus-sasl-md5-2.1.10-4.i386.rpm
cyrus-sasl-plain-2.1.10-4.i386.rpm
cyrus-sasl-gssapi-2.1.10-4.i386.rpm
实现目的：
实现带认证功能的邮件服务器的配置安装
一、Sendmail服务配置
1. 安装RedHat Linux 9.0后，修改/etc/mail/sendmail.mc，修改后文件如下：
divert(-1)dnl
dnl #
dnl # This is the sendmail macro config file for m4. If you make changes to
dnl # /etc/mail/sendmail.mc， you will need to regenerate the
dnl # /etc/mail/sendmail.cf file by confirming that the sendmail-cf package is
dnl # installed and then performing a
dnl #
dnl # make -C /etc/mail
dnl #
include(`/usr/share/sendmail-cf/m4/cf.m4)dnl
VERSIONID(`setup for Red Hat Linux)dnl
OSTYPE(`linux)dnl
dnl #
dnl # Uncomment and edit the following line if your outgoing mail needs to
dnl # be sent out through an external mail server:
dnl #
dnl define(`SMART_HOST，`smtp.your.provider)
dnl #
define(`confDEF_USER_ID，``8:12)dnl
define(`confTRUSTED_USER， `smmsp)dnl
dnl define(`confAUTO_REBUILD)dnl
define(`confTO_CONNECT， `1m)dnl
define(`confTRY_NULL_MX_LIST，true)dnl
define(`confDONT_PROBE_INTERFACES，true)dnl
define(`PROCMAIL_MAILER_PATH，`/usr/bin/procmail)dnl
define(`ALIAS_FILE， `/etc/aliases)dnl
dnl define(`STATUS_FILE， `/etc/mail/statistics)dnl
define(`UUCP_MAILER_MAX， `2000000)dnl
define(`confUSERDB_SPEC， `/etc/mail/userdb.db)dnl
define(`confPRIVACY_FLAGS， `authwarnings，novrfy，noexpn，restrictqrun)dnl
define(`confAUTH_OPTIONS， `A)dnl
dnl #
dnl # The following allows relaying if the user authenticates， and disallows
dnl # plaintext authentication (PLAIN/LOGIN) on non-TLS links
dnl #
dnl define(`confAUTH_OPTIONS， `A p)dnl
dnl #
dnl # PLAIN is the preferred plaintext authentication method and used by
dnl # Mozilla Mail and Evolution， though Outlook Express and other MUAs do
dnl # use LOGIN. Other mechanisms should be used if the connection is not
dnl # guaranteed secure.
dnl #
[color=red:8e47f78b9a]define(QUEUE_DIR， `/var/spool/mqueue/q*)[/color:8e47f78b9a]
[color=red:8e47f78b9a]TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN)dnl[/color:8e47f78b9a]
[color=red:8e47f78b9a]define(`confAUTH_MECHANISMS， `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN)dnl[/color:8e47f78b9a]
dnl #
dnl # Rudimentary information on creating certificates for sendmail TLS:
dnl # make -C /usr/share/ssl/certs usage
dnl #
dnl define(`confCACERT_PATH，`/usr/share/ssl/certs)
dnl define(`confCACERT，`/usr/share/ssl/certs/ca-bundle.crt)
dnl define(`confSERVER_CERT，`/usr/share/ssl/certs/sendmail.pem)
dnl define(`confSERVER_KEY，`/usr/share/ssl/certs/sendmail.pem)
dnl #
dnl # This allows sendmail to use a keyfile that is shared with OpenLDAPs
dnl # slapd， which requires the file to be readble by group ldap
dnl #
dnl define(`confDONT_BLAME_SENDMAIL，`groupreadablekeyfile)dnl
dnl #
dnl define(`confTO_QUEUEWARN， `4h)dnl
dnl define(`confTO_QUEUERETURN， `5d)dnl
dnl define(`confQUEUE_LA， `12)dnl
dnl define(`confREFUSE_LA， `18)dnl
define(`confTO_IDENT， `0)dnl
dnl FEATURE(delay_checks)dnl
FEATURE(`no_default_msa，`dnl)dnl
FEATURE(`smrsh，`/usr/sbin/smrsh)dnl
FEATURE(`mailertable，`hash -o /etc/mail/mailertable.db)dnl
FEATURE(`virtusertable，`hash -o /etc/mail/virtusertable.db)dnl
FEATURE(redirect)dnl
FEATURE(always_add_domain)dnl
FEATURE(use_cw_file)dnl
FEATURE(use_ct_file)dnl
dnl #
dnl # The -t option will retry delivery if e.g. the user runs over his quota.
dnl #
FEATURE(local_procmail，`，`procmail -t -Y -a $h -d $u)dnl
FEATURE(`access_db，`hash -T -o /etc/mail/access.db)dnl
FEATURE(`blacklist_recipients)dnl
EXPOSED_USER(`root)dnl
dnl #
dnl # The following causes sendmail to only listen on the IPv4 loopback address
dnl # 127.0.0.1 and not on any other network devices. Remove the loopback
dnl # address restriction to accept email from the internet or intranet.
dnl #
[color=red:8e47f78b9a]dnl DAEMON_OPTIONS(`Port=smtp，Addr=127.0.0.1， Name=MTA)dnl[/color:8e47f78b9a]
dnl #
dnl # The following causes sendmail to additionally listen to port 587 for
dnl # mail from MUAs that authenticate. Roaming users who cant reach their
dnl # preferred sendmail daemon due to port 25 being blocked or redirected find
dnl # this useful.
dnl #
[color=red:8e47f78b9a]DAEMON_OPTIONS(`Port=25， Name=MSA)dnl[/color:8e47f78b9a]
dnl #
dnl # The following causes sendmail to additionally listen to port 465， but
dnl # starting immediately in TLS mode upon connecting. Port 25 or 587 followed
dnl # by STARTTLS is preferred， but roaming clients using Outlook Express cant
dnl # do STARTTLS on ports other than 25. Mozilla Mail can ONLY use STARTTLS
dnl # and doesnt support the deprecated smtps; Evolution <1.1.1 uses smtps
dnl # when SSL is enabled-- STARTTLS support is available in version 1.1.1.
dnl #
dnl # For this to work your OpenSSL certificates must be configured.
dnl #
dnl DAEMON_OPTIONS(`Port=smtps， Name=TLSMTA， M=s)dnl
dnl #
dnl # The following causes sendmail to additionally listen on the IPv6 loopback
dnl # device. Remove the loopback address restriction listen to the network.
dnl #
dnl # NOTE: binding both IPv4 and IPv6 daemon to the same port requires
dnl # a kernel patch
dnl #
dnl DAEMON_OPTIONS(`port=smtp，Addr=::1， Name=MTA-v6， Family=inet6)dnl
dnl #
dnl # We strongly recommend not accepting unresolvable domains if you want to
dnl # protect yourself from spam. However， the laptop and users on computers
dnl # that do not have 24x7 DNS do need this.
dnl #
FEATURE(`accept_unresolvable_domains)dnl
dnl #
dnl FEATURE(`relay_based_on_MX)dnl
dnl #
dnl # Also accept email sent to "localhost.localdomain" as local email.
dnl #
LOCAL_DOMAIN(`localhost.localdomain)dnl
dnl #
dnl # The following example makes mail from this host and any additional
dnl # specified domains appear to be sent from mydomain.com
dnl #
dnl MASQUERADE_AS(`mydomain.com)dnl
dnl #
dnl # masquerade not just the headers， but the envelope as well
dnl #
dnl FEATURE(masquerade_envelope)dnl
dnl #
dnl # masquerade not just @mydomainalias.com， but @*.mydomainalias.com as well
dnl #
dnl FEATURE(masquerade_entire_domain)dnl
dnl #
dnl MASQUERADE_DOMAIN(localhost)dnl
dnl MASQUERADE_DOMAIN(localhost.localdomain)dnl
dnl MASQUERADE_DOMAIN(mydomainalias.com)dnl
dnl MASQUERADE_DOMAIN(mydomain.lan)dnl
MAILER(smtp)dnl
MAILER(procmail)dnl
文件中，红色字体的行为需要修改的地方，共有五行需要修改。
第一行是手动添加的，与认证无关，作用是启动多个邮件队列，为了获得更好的传输性能。
第二行和第三行是去掉行首的注释。”TRUST_AUTH_MECH”的作用是使sendmail不管access文件中如何设置
，都能 relay 那些通过EXTERNAL， LOGIN， PLAIN， CRAM-MD5或DIGEST-MD5等方式验证的邮件，”confAUTH_MECHANISMS" 的作用是确定系统的认证方式。Outlook Express支持的认证方式是LOGIN。
第四行是加上注释，以便让sendmail可以侦听所有网络设备，为整个网络提供服务，而不仅仅只对本机提供服务。
第五行是修改的，原来内容是:
dnl DAEMON_OPTIONS(`Port=submission， Name=MSA， M=Ea)dnl
去掉行首的注释符，并且将内容修改成Port=25:
DAEMON_OPTIONS(`Port=25， Name=MSA)dnl
在smtp的默认端口(25)上进行认证，而不是587端口。这样就强制所有使用该邮件服务器进行邮件转发的用户在认证后才能发邮件了。
2. 运行：
# m4 /etc/mail/sendmail.mc > /etc/sendmail.cf
用m4重新生成sendmail.cf文件
3. 既然我们打开了多个队列，现在我们在/var/spool/mqueue/下创建任意多个队列目录，运行：
# cd /var/spool/mqueue
# mkdir q1 q2 q3 q4 q5 q6
4. 修改/etc/mail/local-host-names，将希望该邮件服务器使用的邮箱名加进去，比如邮箱为：xxx@abc.com.cn则将abc.com.cn加入到该文件中。
5. 重新启动sendmail服务，运行：
# killall –HUP sendmail
6. 可以通过telnet 本机IP 25来验证sendmail服务是否已经正常启动，若登陆成功，则说明sendmail服务已经成功启动。
# telnet localhost 25
Trying 127.0.0.1...
Connected to localhost.
Escape character is ^]
220 localhost.localdomain ESMTP Sendmail 8.12.8/8.12.8; Wed， 12 May 2004 15:57:01 +0800
ehlo localhost
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-AUTH GSSAPI LOGIN PLAIN
250-DELIVERBY
250-HELP
quit
#
在AUTH后面有LOGIN就基本上可以在OutlookExpress上认证了。
二、Pop3服务配置：
1. 运行：
# ntsysv
在系统服务列表中选中ipop3，选’OK’保存推出
2. 重启xinetd服务，运行：
# service xinetd restart
3. 运行netstat命令看smtp和pop3服务是否都已经启动
# netstat –l