哈哈网本文介绍如何在用Postfix 和Dovecot 在CentOS 6 上搭建一个 POP3/IMAP/SMTP 邮件服务器。你可能不知道啥子是Postfix，这货是Sendmail的完美替代品，sendmail不但发信慢，而且还容易堆积一堆邮件，消耗服务器资源。Postfix不但速度快，而且容易管理，还更安全。
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升级系统
screen -U -S mailserver-screen yum update
创建用户组
groupadd vmail -g 2222
创建用户
useradd vmail -r -g 2222 -u 2222 -d /var/vmail -m -c "mail user"
安装Postfix
yum remove exim sendmail yum install postfix cronie
修改postfix 配置文件 main.cf
cp /etc/postfix/main.cf{,.orig}
vim /etc/postfix/main.cf
myhostname = fatesinger.com mydomain = fatesinger.com myorigin = $mydomain queue_directory = /var/spool/postfix command_directory = /usr/sbin daemon_directory = /usr/libexec/postfix data_directory = /var/lib/postfix mail_owner = postfix unknown_local_recipient_reject_code = 550 alias_maps = hash:/etc/postfix/aliases alias_database = $alias_maps inet_interfaces = all inet_protocols = ipv4 mydestination = $myhostname, localhost.$mydomain, localhost debug_peer_level = 2 debugger_command = PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin ddd $daemon_directory/$process_name $process_id & sleep 5 sendmail_path = /usr/sbin/sendmail.postfix newaliases_path = /usr/bin/newaliases.postfix mailq_path = /usr/bin/mailq.postfix setgid_group = postdrop html_directory = no manpage_directory = /usr/share/man sample_directory = /usr/share/doc/postfix-2.6.6/samples readme_directory = /usr/share/doc/postfix-2.6.6/README_FILES relay_domains = * virtual_alias_maps=hash:/etc/postfix/vmail_aliases virtual_mailbox_domains=hash:/etc/postfix/vmail_domains virtual_mailbox_maps=hash:/etc/postfix/vmail_mailbox virtual_mailbox_base = /var/vmail virtual_minimum_uid = 2222 virtual_transport = virtual virtual_uid_maps = static:2222 virtual_gid_maps = static:2222 smtpd_sasl_auth_enable = yes smtpd_sasl_type = dovecot smtpd_sasl_path = /var/run/dovecot/auth-client smtpd_sasl_security_options = noanonymous smtpd_sasl_tls_security_options = $smtpd_sasl_security_options smtpd_sasl_local_domain = $mydomain broken_sasl_auth_clients = yes smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination smtpd_relay_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination
创建vmail_domains配置文件
vim /etc/postfix/vmail_domains
mydomain.com OK my-otherdomain.com OK
创建vmail_mailbox配置文件
vim /etc/postfix/vmail_mailbox
info@mydomain.com mydomain.com/info/ info@my-otherdomain.com my-otherdomain.com/info/
创建vmail_aliases配置文件
vim /etc/postfix/vmail_aliases
info@mydomain.com info@mydomain.com info@my-otherdomain.com foo@bar.tld
hash 配置文件
postmap /etc/postfix/vmail_domains postmap /etc/postfix/vmail_mailbox postmap /etc/postfix/vmail_aliases
touch /etc/postfix/aliases vim +/submission /etc/postfix/master.cf
submission inet n - n - - smtpd
安装DOVECOT
yum install dovecot
修改dovecot的配置文件dovecot.conf
cp /etc/dovecot/dovecot.conf{,.orig}
vim /etc/dovecot/dovecot.conf
listen = *
ssl = no
protocols = imap lmtp
disable_plaintext_auth = no
auth_mechanisms = plain login
mail_access_groups = vmail
default_login_user = vmail
first_valid_uid = 2222
first_valid_gid = 2222
#mail_location = maildir:~/Maildir
mail_location = maildir:/var/vmail/%d/%n
passdb {
driver = passwd-file
args = scheme=SHA1 /etc/dovecot/passwd
}
userdb {
driver = static
args = uid=2222 gid=2222 home=/var/vmail/%d/%n allow_all_users=yes
}
service auth {
unix_listener auth-client {
group = postfix
mode = 0660
user = postfix
}
user = root
}
service imap-login {
process_min_avail = 1
user = vmail
}
创建虚拟用户的密码文件。用户名和密码会储存在这里。
touch /etc/dovecot/passwd doveadm pw -s sha1 | cut -d '}' -f2
vim /etc/dovecot/passwd
info@mydomain.com:DOzcsKI8HY0bg8LAuz0DPKwS3WA=
chown root: /etc/dovecot/passwd chmod 600 /etc/dovecot/passwd
启动服务
chkconfig postfix on chkconfig dovecot on service postfix restart service dovecot restart
如果是centos7 则使用如下命令
systemctl enable postfix.service systemctl enable dovecot.service systemctl start postfix.service systemctl start dovecot.service
之后就可以测试收发邮件了。
