SENDMAIL
[加密 認證 電子郵件服務器！]
一種強大的郵件傳輸代理程序，一般電子郵件的流程：用戶代理 傳輸和投遞代理
實驗步驟：
使用rpm或使用yum平臺安裝sendmail-8.13.8-2.el5及一些相關的相關程序和工具！(程序----sendmail-cf、工具---sendmail-doc和m4)
rpm -ivh sendmail-8.13.8-2.el5
rpm -ivh sendmail-cf-8.13.8-2.el5
rpm -ivh sendmail-doc-8.13.8-2.el5
rpm -ivh m4-1.4.5-3.el5.1
-----安裝之後主要的文件都在 /etc/mail目錄下；
[1]、其中sendmail的主配置文件是： sendmail.mc然後修改配置文檔如下：
[2]、還有sendmail的數據庫文件access
[3]、修改本地計算機的別名；
在/etc/mail/目錄下中的 local-host-names文件中；
[4]、重啓sendmail服務；
[5]、創建幾個用戶；
[6]、DNS服務器的配置
-----------(1)、bind-chroot-9.3.6-4.P1.el5；
-----------(2)、bind-9.3.6-4.P1.el5
-----------(3)、caching-nameserver-9.3.6-4.P1.el5
在目錄 /var/named/chroot/etc/ 下：
cp -p named-localhostnamed-conf named.conf
[配置文件:/var/named/chroot/etc/named.conf]
修改區域聲明文件：[named.rfc1912.zones]
生成數據庫
修改主機名：
vim /etc/sysconfig/network
修改hosts文件：
vim /etc/hosts
[7]、重啓系統在進行下面的操作！
sendmail驗證服務之前安裝-------dovecot包
[8]、配置證書服務！
[root@mail CA]# mkdir crl certs newcerts
[root@mail CA]# touch serical index.txt
[root@mail CA]# echo "01" >serical
[root@mail CA]# openssl req -x509 -new -key private/cakey.pem -out cacert.pem -days 3650
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [GB]:CN
State or Province Name (full name) [Berkshire]:henan
Locality Name (eg, city) [Newbury]:zhengzhou
Organization Name (eg, company) [My Company Ltd]:zzu
Organizational Unit Name (eg, section) []:tec
Common Name (eg, your name or your server's hostname) []:hanyu
[root@mail mail]# mkdir /etc/mail/certs
[root@mail mail]# cd /etc/mail/certs/
[root@mail certs]# openssl genrsa 1024 >sendmail.key
[root@mail certs]# openssl req -new -key sendmail.key -out sendmail.csr
[root@mail certs]# openssl ca -in sendmail.csr -out sendmail.cert
[root@mail certs]# cp /etc/pki/CA/cacert.pem .
[root@mail mail]# vim /etc/mail/sendmail.mc
