Centos7+postfix+dovecot for Messaging

Centos7+postfix+dovecot for Messaging

When it comes to mail systems, there are many, such as Microsoft's Exchange, Office365, IBM Lotus, and the mainstream third-party messaging system. Of course, these are fees, if for small environment use, can use Linux under the deployment of Postfix+dovecot to achieve mail transceiver, of course, there are many services under Linux to achieve mail delivery, today we mainly introduce the centos7+postfix+ Dovecot to send and receive mail, specifically see below:

First of all, install the CENTOS7, after installation, we need to configure some of the system settings;

1.selinux off, sed–i ' s/enforcing/disabled/g '/etc/selinux/config2. firewall-cmd–add-port= ' 110/tcp ' –permanent firewall-cmd–add-port= ' 25/tcp ' –permanent

When you're ready, check the system version first.

Cat/etc/redhat-release

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Centos7 is a self-postfix service, so we don't have to install it separately;

Rpm–qa | grep postfix

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We found that the system comes with a postfix service, so we don't have to install

Postfix 2.10.1-6.el7.x86_64

Then that is to say postfix basic configuration, of course, postfix configuration is very much, we do not introduce more, first introduce the basic configuration of sending mail

We first check the default configuration of the default postfix by taking a look at those that need to be modified

Grep-v ' ^# '/etc/postfix/main.cf | Grep-v ' ^$ '

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Vim/etc/postfix/main.cf

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Myhostname =pfx.ixmsoft.com #定义主机名mydomain =ixmsoft.com #定义域名myorigin = $mydomain #定义组织域

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Inet_interfaces =all Define network region Inet_portocols =all Definition Protocol

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We need to add a $mydomain after the value of mydestination, if not added, the recipient's address will be a problem, if added, the user will send a message directly [email protected]

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Uncomment #local_recipient_maps =

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Grep-v ' ^# '/etc/postfix/main.cf | Grep-v ' ^$ '

After modifying the Save exit, we view the reverse configuration

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After saving the exit, we start the Postfix service and view the port status,

Systemctl start Postfixsystem Enable Postfixnetstat–anlpt

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Next we install the Dovecot service, which mainly provides POP3, IMAP services

Yum Install Dovecot

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Installation Complete

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Next we look at the default configuration file for Dovecot

We see that the following include can contain the configuration file path strength, the *.conf file in this path will take effect

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We enable protocols for the following protocols

protocols = IMAP POP3 LMTP enable port monitoring Listen = *,::

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Save exit

Grep-v ' ^# '/etc/dovecot/dovecot.conf | Grep-v ' ^$ '

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Vim/etc/dovecot/conf.d/10-auth.confdisable_plaintext_auth = No

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Auth_mechanisms = Plain Login!include auth-system.conf.ext

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Save exit

Grep-v ' ^# '/etc/dovecot/conf.d/10-auth.conf | Grep-v ' ^$ '

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Disable SSL authentication, as follows:

Of course, you can not cancel the SSL, according to their own environment to set

Vim/etc/dovecot/conf.d/10-ssl.confssl = No

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Enable the Dovecot log, as follows:

vim/etc/dovecot/conf.d/10-logging.conf Add info_log_path =/var/log/dovecot_info.logdebug_log_path =/var/log/dovecot _debug.log

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Then start the service

Systemctl start Dovecotsystemctl Enable Dovecot

We've seen 110, 143 are already listening.

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Next we create a test user

Useradd zspasswd ZS

Then enter the old and new password

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And then we start testing.

[[Email protected] ~]# telnet localhost 110Trying:: 1...Connected to localhost. Escape character is ' ^] '. +ok dovecot ready.user zs+okpass 123456-err [sys/temp] Internal error occurred. Refer to server log for more information. Connection closed by foreign host.

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We look at log

[[Email protected] ~]# tail -f /var/log/maillogdec 21 00:37:58 pfx  postfix/postfix-script[9570]: stopping the Postfix mail systemDec 21  00:37:58 pfx postfix/master[9553]: terminating on signal 15dec 21  00:38:01 pfx postfix/postfix-script[9654]: starting the postfix mail  systemdec 21 00:38:01 pfx postfix/master[9656]: daemon started --  Version 2.10.1, configuration /etc/postfixdec 21 00:38:08 pfx postfix/smtpd [9661]: warning: hostname bogon does not resolve to address  192.168.5.20: name or service not knowndec 21 00:38:08 pfx  postfix/smtpd[9661]: connect from unknown[192.168.5.20]dec 21 00:38:20 pfx  Postfix/smtpd[9661]: lost connection after connect from unknown[192.168.5.20]dec 21 00:38:20 pfx  Postfix/smtpd[9661]: disconnect from unknown[192.168.5.20]dec 21 00:55:46 pfx  DOVECOT: POP3 (ZS):  error: user zs: initialization failed: namespace   ': mail storage autodetection failed with home=/home/zsdec 21  00:55:46 PFX DOVECOT: POP3 (ZS):  error: invalid user settings. refer  to server log for more information.

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We switched to just the user

Su–zs then creates the INBOX directory for user ZS, Mkdir-p ~/mail/.imap/inbox

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And then try it again.

[[Email protected] ~]# telnet localhost 110Trying:: 1...Connected to localhost. Escape character is ' ^] '. +ok dovecot ready.user zs+okpass 123456+ok logged in.

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Test Send mail

[[Email protected]/]# telnet localhost 25Trying:: 1...Connected to localhost. Escape character is ' ^] '. mail.ixmsoft.com ESMTP postfixmail from:[email protected]250 2.1.0 okrcpt to:[email protected ]250 2.1.5 Okdata354 End data with <cr><lf>.<cr><lf>this is Test mail.250 2.0.0 ok:queued as A702 d400fc14quit221 2.0.0 byeconnection closed by foreign host.

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We view Mail

[[Email protected]/]# telnet localhost 110Trying:: 1...Connected to localhost. Escape character is ' ^] '. +ok dovecot ready.user ls+okpass 123456+ok logged in.list+ok 1 messages:1 409.

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We need to create a directory every time, more trouble, we can not use the script it

To set up a mail hosting directory:

vim/etc/dovecot/conf.d/10-mail.conf Remove the following comment mail_location = mbox:~/mail:inbox=/var/mail/%u #指定邮件的位置

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Restart the Dovecot service systemctl Restart Dovecot Modify the Create User template file to automatically generate the mail directory when the user creates it vim/etc/skel/.bash_profile add a profile, if[!-D ~/mail /.imap/inbox]; Thenmkdir-p ~/mail/.imap/inboxfi Note: If it is a copy, it is best to perform the following encoding format before saving the rollout: Set Format=unix or you can download the attachment, replace the current configuration file

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After you save the exit, execute it for quick entry.

source. bash_profile

Next we need to create a test user, after the user is created, after using the new user login, will automatically create the relevant directory, and then directly can use the mailbox, we can also use Outlook or other means of testing the message, again do not test;

If you want to have external and internal mail, you need to publish the server 110, 25 to the external network, and then the external domain name provider configuration MX record resolution and a record resolution, so that the mail can be returned.

We finally used Foxmail to test the intranet;

We configure two accounts, ZS, LS users to send and receive e-mail tests:

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We'll add another LS account.

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Use ZS to send an e-mail to LS

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ZS received the mail.

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LS also received an e-mail.

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This article from "Gao Wenrong" blog, declined reprint!

Centos7+postfix+dovecot for Messaging