用redhat8.0自带的sendmail+sasl配置邮件服务器邮件服务器教程 -免费技术教程下载中心

              摘要：用redhat8.0自带的sendmail+sasl配置邮件服务器
一直也没有用过redhat 8.0,好多网友都说他的sendmail配置有点问题。今天终于安装了一次redhat 8,感觉还可以。

我也配置了一下，要是简单配置，和redhat7.2没什么太大区别。当然了，我是说他的最简单配置。

redhat8默认安装的是sendmail8.12.5.
我的系统安装时，选择的是custom,sendmail默认安装。
设置你的nds server,我的域名是webmail.readchina.com
添加一条MX纪录@  IN MX 10 webmail.readchina.com.

安装完系统后，我通过x-windowns看到系统设置--mail transport agent switcher,默认是postfix,我选着了sendmail作为邮件传输代理。
开始安装：
一、首先，要生成sendmail.cf文件，一般是编译sendmail.mc来生成sendmail.cf,这样的好处是通过编译，会查看出一些sendmail的设置错误和漏洞。
# cd /etc/mail
# vi sendmail.mc
divert(-1)
dnl This is the sendmail macro config file. If you make changes to this file,
dnl you need the sendmail-cf rpm installed and then have to generate a
dnl new /etc/mail/sendmail.cf by running the following command:
dnl
dnl        m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf
dnl
include(`/usr/share/sendmail-cf/m4/cf.m4')
VERSIONID(`linux setup for Red Hat Linux')dnl
OSTYPE(`linux')
dnl Uncomment and edit the following line if your mail needs to be sent out
dnl through an external mail server:
dnl define(`SMART_HOST',`smtp.your.provider')
define(`confDEF_USER_ID',``8:12'')dnl
undefine(`UUCP_RELAY')dnl
undefine(`BITNET_RELAY')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
TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
DAEMON_OPTIONS(`Port=25,Name=MTA')dnl
DAEMON_OPTIONS(`Port=587,Name=MSA,M=Ea')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 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 The '-t' option will retry delivery if e.g. the user runs over his quota.
FEATURE(local_procmail,`',`procmail -t -Y -a $h -d $u')dnl
FEATURE(`access_db',`hash -T<TMPF> -o /etc/mail/access.db')dnl
FEATURE(`blacklist_recipients')dnl
EXPOSED_USER(`root')dnl
dnl This changes sendmail to only listen on the loopback device 127.0.0.1
dnl and not on any other network devices. Comment this out if you want
dnl to accept email over the network.
dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
dnl NOTE: binding both IPv4 and IPv6 daemon to the same port requires
dnl       a kernel patch
dnl DAEMON_OPTIONS(`port=smtp,Addr=::1, Name=MTA-v6, Family=inet6')
dnl We strongly recommend to comment this one out if you want to protect
dnl yourself from spam. However, the laptop and users on computers that do
dnl not have 24x7 DNS do need this.
dnl FEATURE(`accept_unresolvable_domains')dnl
dnl FEATURE(`relay_based_on_MX')dnl
MAILER(smtp)dnl
MAILER(procmail)dnl
Cwlocalhost.localdomain
其中：
1、2是我打开注解的，是打开相应的认证机制，主要是为了支持outlook
3、4是我添加的，设置相应的mta and msa的所用端口。
5、6要注掉。
1、TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
2、define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl
3、DAEMON_OPTIONS(`Port=25,Name=MTA')dnl
4、DAEMON_OPTIONS(`Port=587,Name=MSA,M=Ea')dnl
5、dnl DAEMON_OPTIONS(`Port=smtp,Addr=127.0.0.1, Name=MTA')
6、dnl FEATURE(`accept_unresolvable_domains')dnl
最后保存。
二、编译sendmail.mc 生成sendmail.cf文件
# m4 /etc/mail/sendmail.mc > /etc/sendmail.cf
#/etc/rc.d/init.d/sendmail restart   --重起sendmail服务。
三、检测编译结果。
1、检测SASL被编译到sendmail中。
#/usr/sbin/sendmail -d0.1 -bv root |grep SASL
输出类似如下：
NETUNIX NEWDB NIS PIPELINING SASL SCANF STARTTLS TCPWRAPPERS
保证你看到SASL就是正确的。
2、检测25端口：
# telnet localhost 25
Trying 127.0.0.1.....
Connected to localhost (127.0.0.1).
Escape character is '^]'.
220 webmail.readchina.com ESMTP SENDMAIL 8.12.5/8.12.5;THU,13 FEB 2003.19:12:59 +0800
EHLO localhost   --打个招呼
250-webmail.readchina.com hello localhost [127.0.0.1],pleased to meet you
250-ENHANCEDSTATUSCODES
250-PIPELINING
250-8BITMIME
250-SIZE
250-DSN
250-ETRN
250-AUTH GSSAPI LOGIN PLAIN
250-DELIVERBY
250-HELP
quit   ---退出
只要输出有LOGIN PLAIN就OK!了，不然，就不能relay mail.
到这里，sendmail就配置完了，你可以天天加一个用户试试看。
邮件用户是系统用户.
#useradd -d /home peng peng
#passwd peng   ----设置密码
设置你的foxmail or outlook,要设置上用户需要smtp认证。
有的网友说，必须把你的域名添加到/etc/mail/local-host-names中，我没有添加，也可以发送。我英

为是在局域网中测试，发信没问题，不知道收信有没有问题。你最好加上吧。当你要支持虚拟域时，必

须都要加上的。
四、pop3安装。
redhat8.0中有它的rpm包，是imap-2001a.15.rpm
# rpm -ivh imap-2001a.rpm
#/etc/xinetd.d/ipop3
  disable =no
#/etc/rc.d/init.d/xinetd restart   --重起pop3服务
#telnet localhost 110
Trying 127.0.