Linux下邮件系统总结

Sendmail
RPM Packages, sendmail sendmail-cf sendmail-doc
#Lsof –i:25 
#service postfix stop
#yum install –y sendmail*
#cd /etc/mail
#vi sendmail.mc
DAEMON_OPTIONS(* Addr=0.0.0.0,  *) #receive all the requests
#vi local-host-names #aloow mail.qq.com to send email
mail.qq.com
#service sendmail restart
#netstat –ntlp |grep 25
#useradd a
#useradd b
#mail
Subject:hell

.    #.means end
#su – a
$ mail   #receive mail
1   #1 means read the 1st mail

Use qq.com as mail.qq.com
#vim local-host-name
qq.com
#vi sendmail.mc
MASQUERADE_AS(`qq.com`)dnl
FEATURE(masquerade_envelope)dnl
FEATURE(masquerade_entire_domain)dnl

Email Relay
#vi access 
192.168.0.44    RELAY    #admit email from 192.168.0.44 to relay to other MTA

Postfix
#vi /etc/postfix/main.cf
myhostname = mail.qq.com
mydomain = qq.com     #let take affect
myorigin = $mydomain   #show the sender like
inet_interfaces=all #change from localhost to all,listen from all
mydestination=….,$mydomain  #remove localhost$mydomain #

Sendmail 的接收配置● 修改 /etc/mail/sendmail.mc 来监听所有接口
 dnl DAEMON_OPTIONS（‘Port=smtp，Addr=127.0.0.1，Name=MTA’）dnl
● 将服务器肯能引用的每个主机名都添加到 /etc/mail/loca-host-names 中
● 修改访问控制
     ● 更新 /etc/hosts.{allow,deny}文件
     ● 添加一条 Netfilter 规则来允许 SMTP 流量
● 重启 sendmail
Sendmail 的发送配置
红帽提供了默认的 /etc/mail/submit.cf 文件
     ● 极少需要修改
     ● 启用 sendmail 来充当客户端 MSP
● 要伪装成域不是一个单个主机
     ● 删除 /etc/mail/sendmail.mc 中以下注释符号
        EXPOSED_USER（‘root’）dnl
        FEATURE（masquerade_envelope）dnl
        MASQUERADE_AS（‘example.com’）dnl
        FEATURE（masquerade_entire_domain）dnl
     ● 这些选项和重新编写出站地址结合使用