用redhat8.0自带的sendmail+sasl配置需要认证的邮件服务器,以及把sendmail8.12.5升级到sendmail.8.12.9 redhat8默认安装的是sendmail8.12.5. 系统安装时，选择的是custom,sendmail默认安装。 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 dnl TRUST_AUTH_MECH(`EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')dnl dnl define(`confAUTH_MECHANISMS', `EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN')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 -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 FEATURE(`relay_based_on_MX')dnl MAILER(smtp)dnl MAILER(procmail)dnl Cwlocalhost.localdomain 其中： 1、2是打开注解的，是打开相应的认证机制，主要是为了支持Outlook 3、4是添加的，设置相应的mta and msa的所用端口。 5、6要注掉。 5允许通过网络连接Sendmail,6 禁止不可解析的域名relay邮件 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') 最后保存。 二、编译sendmail.mc 生成sendmail.cf文件 # m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf # /etc/rc.d/init.d/sendmail restart --重起sendmail服务。 假如你在执行m4 /etc/mail/sendmail.mc > /etc/mail/sendmail.cf 报错的话，那么检查是否安装sendmail-cf.*.rpm，redhat8.0自带的是 sendmail-cf-8.12.5-7.i386.rpm，在安装盘的第3张，安装方法：# rpm -ivh sendmail-cf-8.12.5-7.i386.rpm 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： [root@fyhtest mail]# telnet localhost 25 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. 220 fyhtest.163.net ESMTP Sendmail 8.12.5/8.12.5; Thu, 10 Apr 2003 16:35:42 -0400 ehlo test 250-fyhtest.163.net Hello localhost [127.0.0.1], pleased to meet you 250-ENHANCEDSTATUSCODES 250-PIPELINING 250-8BITMIME 250-SIZE 250-DSN 250-ETRN 250-AUTH 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 test #passwd test ----设置密码 设置你的FoxMail or outlook,要设置上用户需要smtp认证。 把你的域名添加到/etc/mail/local-host-names中. 四、pop3安装。 redhat8.0中有它的rpm包，是imap-2001a-15.i386.rpm # rpm -ivh imap-2001a-15.i386.rpm 修改/etc/xinetd.d/ipop3 把其中disable =yes更改为disable =no 修改/etc/xinetd.d/imap 把其中disable =yes更改为disable =no # /etc/rc.d/init.d/xinetd restart --重起pop3服务 [root@fyhtest xinetd.d]# telnet localhost 110 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. +OK POP3 localhost v2001.78rh server ready [root@fyhtest xinetd.d]# telnet localhost 143 Trying 127.0.0.1... Connected to localhost. Escape character is '^]'. * OK [CAPABILITY IMAP4REV1 LOGIN-REFERRALS STARTTLS AUTH=LOGIN] localhost IMAP4rev1 2001.315rh at Thu, 10 Apr 2003 16:41:06 -0400 (EDT) 有以上显示，为正确。 五、其他设置。 要想更好的使用sendmail，常用到的一些设置： 1、限制最大邮件。 vi /etc/sendmail.cf # maximum message size O MaxMessageSize=5000000 (注：5M) 2、最大的群发数目。 vi /etc/sendmail.cf # maximum number of recipients per SMTP envelope O MaxRecipientsPerMessage=20 （注：20个） 3、域名文件----local-host-name 可以用他来实现虚拟域名或多域名支持。 /etc/mail/local-host-name test.com test1.com 4、mail别名文件--aliases。 vi /etc/aliases
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