CentOS installation configuration Postfix mail server

Date: July 6, 2012//Category: Mail//No Comments

Before installing the mail server, you should know a few nouns and use them later:

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MUA：用户代理端，即用户使用的写信、收信客户端软件MTA：邮件传送端，即常说的邮件服务器，用于转发、收取用户邮件。MDA：邮件代理端，相当于MUA和MTA的中间人，可用于过滤垃圾邮件。POP：邮局协议，用于MUA连接服务器收取用户邮件，通信端口110。IMOP：互联网应用协议，功能较POP多，通信端口143。SMTP：简单邮件传送协议，MUA连接MTA或MTA连接MTA发送邮件使用此协议，通信端口25。

This configuration MTA takes postfix as an example, is simpler, more secure, and SendMail compatible with SendMail.
POSTFI Installation:

123	yum installpostfixyum remove sendmail/etc/init.d/postfixstart

Postfix Master configuration settings:

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cat/etc/postfix/ MAIN.CF myhostname = mail.haiyun.me #Mail服务器域名, ehlo name. mydomain = www.haiyun.me # myorigin = $mydomain # Sending address, this setting is displayed as @www.haiyun.me. inet_interfaces = All #如对外提供MTA服务设置为监听所有网卡, and only listens locally by default. inet_protocols = all #支持协议, optional Ipv4/ipv6. mydestination = $mydomain $myhostname #本地邮件域名, receive directly mynetworks_style = subnet #允许转发的来源网段, optional subnet subnet, class segment, host native mynetworks = 192.168.1.0/24,127.0.0.0/8 #允许转发的来源IP, ignoring mynetworks_style parameters after setting relay_domains = $mydestination #允许转发的目标域 smtpd_banner = $ Myhostname ESMTP "Mail Server" #自定服务器信息

Now postfix allow to receive or send mail:

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接收邮件：目的地为$inet_interfaces的邮件；目的地为$mydestination或$vitual_alias_maps的邮件。转发邮件：来源客户端符合$mynetworks的邮件；来源或目的为$relay_domains的邮件。

To configure mail aliases:

123	cat /etc/aliasestest:root,[email protected]别名:收件地址1，收件地址2

To update the alias database:

1	newaliases

To configure mail forwarding:

12	cat ~/.forward[email protected],[email protected]

Set the SMTP password authentication to prevent the MTA from being abused in Postfix with a configured trust segment, such as an external network that can use SMTP password authentication.
The system User password authentication, first start the SASLAUTHD service to assist Postfix system Password Authentication:

123	/etc/init.d/saslauthdstartchkconfig saslauthd onyum installcyrus-sasl-plain cyrus-sasl-md5 cyrus-sasl

Determine that the SMTPD configuration file has the following contents:

12	cat /usr/lib/sasl2/smtpd.conf pwcheck_method: saslauthd #saslauthd协助smtp进行密码验证

Configure Postfix to use SASL authentication, edit MAIN.CF profile to add:

Test:testsaslautd-u username-p ' password '

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smtpd_sasl_auth_enable = yes #开启SMTP验证smtpd_sasl_security_options = noanonymous #不允许匿名用户smtpd_recipient_restrictions =   #接收者限制规则，按顺序执行     permit_mynetworks,      #mynetworks用户通过，匹配结束     permit_sasl_authenticated,  #sasl验证用户通过，匹配结束     reject_unknown_sender_domain, #拒绝无效的发送邮件域名     reject_unauth_destination #拒绝收件人非mydestination、relay_domains或virtual_alias_maps定义域邮件

To test whether SMTP authentication is in effect:

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telnet localhost 25Trying ::1...Connected to localhost.Escape character is ‘^]‘.220 mail.domain.com ESMTP Postfixehlo localhost250-mail.domain.com250-PIPELINING250-SIZE 10240000250-VRFY250-ETRN250-AUTH LOGIN PLAIN #显示此信息代表验证正常250-ENHANCEDSTATUSCODES250-8BITMIME250 DSN

Configure IMAP and POP:

1	yum -y install dovecot

To edit the dovecot configuration file:

123	vim /etc/dovecot/dovecot.conf protocols = imap pop3 #监听协议login_trusted_networks = 127.0.0.1 #允许登录接收邮件的IP段

To set up a mail directory:

12	cat /etc/dovecot/conf.d/10-mail.conf mail_location = mbox:~/mail:INBOX=/var/mail/%u

New mail Account:

1	useradd -g mail -s /sbin/nologin user

To start the Dovecot service:

1	/etc/init.d/dovecot start

CentOS installation configuration Postfix mail server