本文介紹如何在用Postfix 和Dovecot 在CentOS 6 上搭建一個 POP3/IMAP/SMTP 郵件伺服器。你可能不知道啥子是Postfix，這貨是Sendmail的完美替代品，sendmail不但發信慢，而且還容易堆積一堆郵件，消耗伺服器資源。Postfix不但速度快，而且容易管理，還更安全。
如果你不會使用VI指令，請手動上傳下載下傳更新相應檔案。路徑為VI指令中的路徑。
更新系統
screen -U -S mailserver-screen
yum update
建立使用者組
groupadd vmail -g 2222
建立使用者
useradd vmail -r -g 2222 -u 2222 -d /var/vmail -m -c "mail user"
安裝Postfix
yum remove exim sendmail
yum install postfix cronie
修改postfix 配置檔案 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
建立vmail_domains配置檔案
vim /etc/postfix/vmail_domains
mydomain.com OK
my-otherdomain.com OK
建立vmail_mailbox配置檔案
vim /etc/postfix/vmail_mailbox
[email protected] mydomain.com/info/
[email protected] my-otherdomain.com/info/
建立vmail_aliases配置檔案
vim /etc/postfix/vmail_aliases
[email protected] [email protected]
[email protected] [email protected]
hash 配置檔案
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
安裝DOVECOT
yum install dovecot
修改dovecot的配置檔案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
}
建立虛拟使用者的密碼檔案。使用者名和密碼會儲存在這裡。
touch /etc/dovecot/passwd
doveadm pw -s sha1 | cut -d '}' -f2
vim /etc/dovecot/passwd
[email protected]:DOzcsKI8HY0bg8LAuz0DPKwS3WA=
chown root: /etc/dovecot/passwd
chmod 600 /etc/dovecot/passwd
啟動服務
chkconfig postfix on
chkconfig dovecot on
service postfix restart
service dovecot restart
如果是centos7 則使用如下指令
systemctl enable postfix.service
systemctl enable dovecot.service
systemctl start postfix.service
systemctl start dovecot.service
之後就可以測試收發郵件了。