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Centos6.3下搭建sendmaildovecot邮局服务器1.MX解析不说了。2.安装配置dovecot也不多说了。3.安装配置sendmail软件 yum install -y sendmail sendmail-cf m4切换系统MTA服务rootlocalhost postfix# service postfix stop关闭 postfix： 确定rootlocalhost postfix# alternatives config mta共有 2 个程序提供“mta”。 选择 命令 + 1 /usr/sbin/sendmail.postfix* 2 /usr/sbin/sendmail.sendmail按 Enter 来保存当前选择+，或键入选择号码：2rootlocalhost postfix#配置sendmail1rootlocalhost mail# cat sendmail.mc |grep -v dnl |awk -F: print $1 divert(-1)dnlinclude(/usr/share/sendmail-cf/m4/cf.m4)dnlVERSIONID(setup for linux)dnlOSTYPE(linux)dnldefine(confDEF_USER_ID, “8define(confTO_CONNECT, 1m)dnldefine(confTRY_NULL_MX_LIST, True)dnldefine(confDONT_PROBE_INTERFACES, True)dnldefine(PROCMAIL_MAILER_PATH, /usr/bin/procmail)dnldefine(ALIAS_FILE, /etc/aliases)dnldefine(STATUS_FILE, /var/log/mail/statistics)dnldefine(UUCP_MAILER_MAX, 2000000)dnldefine(confUSERDB_SPEC, /etc/mail/userdb.db)dnldefine(confPRIVACY_FLAGS, authwarnings,novrfy,noexpn,restrictqrun)dnldefine(confAUTH_OPTIONS, A)dnlTRUST_AUTH_MECH(EXTERNAL DIGEST-MD5 CRAM-MD5 LOGIN PLAIN)dnl （大约在53行，去掉注释）define(confAUTH_MECHANISMS, EXTERNAL GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN PLAIN)dnl （去掉注释）define(confTO_IDENT, 0)dnlFEATURE(no_default_msa, dnl)dnlFEATURE(smrsh, /usr/sbin/smrsh)dnlFEATURE(mailertable, hash -o /etc/mail/mailertable.db)dnlFEATURE(virtusertable, hash -o /etc/mail/virtusertable.db)dnlFEATURE(redirect)dnlFEATURE(always_add_domain)dnlFEATURE(use_cw_file)dnlFEATURE(use_ct_file)dnlFEATURE(local_procmail, , procmail -t -Y -a $h -d $u)dnlFEATURE(access_db, hash -T -o /etc/mail/access.db)dnlFEATURE(blacklist_recipients)dnlEXPOSED_USER(root)dnlDAEMON_OPTIONS(Port=smtp,Addr=0.0.0.0, Name=MTA)dnl 原为 Addr=127.0.0.1 修改为 ：Addr=0.0.0.0FEATURE(accept_unresolvable_domains)dnlLOCAL_DOMAIN(localhost.localdomain)dnlMAILER(smtp)dnlMAILER(procmail)dnlrootlocalhost mail#配置sendmail-2rootlocalhost mail# cat access |grep -v #Connect:localhost.localdomain RELAYConnect:localhost RELAYConnect:127.0.0.1 RELAYConnect:abc.com RELAY /#添加转发中继或许允许那些源可以使用该邮局服务器rootlocalhost mail#配置sendmail-3（将mc文件转换为cf格式和生成access.db的数据库文件）rootlocalhost mail# m4 sendmail.mcsendmail.cf /*将mc文件转换为cfrootlocalhost mail# makemap hash access.db access /*将access生成access.db的数据库文件rootlocalhost mail# service sendmail start正在启动 sendmail： 确定启动 sm-client： 确定rootlocalhost mail#创建用户进行测试。这里上面创建了test0 和test1用户了。不再新建用户了。使用不同的邮件客户端（thunderbird）进行测试测试
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