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Let's follow the author to learn how to build an email cloud server in dovecot+mysql. I believe you will benefit a lot after reading it. There are not many words in it. I hope this short article on how to build an email cloud server in dovecot+mysql is what you want.

1. [root@westos-mail ~] # yum install dovecot-mysql.x86_64-y#dovecot plugin, so that this software can recognize mysql###

2. [root@westos-mail ~] # vim / etc/dovecot/conf.d/10-auth.conf # authentication file

123! include auth-sql.conf.ext # agrees to mysql certification

3.cp / usr/share/doc/dovecot-2.2.10/example-config/dovecot-sql.conf.ext / etc/dovecot/dovecot-sql.conf.ext # generate dovecot read mysql configuration

4. [root@westos-mail ~] # vim / etc/dovecot/dovecot-sql.conf.ext # modify configuration

32 driver = mysql # database type

71 connect = host=localhost dbname=email user=postuser password=postuser # Library, user, password for login (connection query)

78 default_pass_scheme = PLAIN # the default authentication method is plaintext

108 SELECT username, domain, password\ # query password match

109 FROM emailuser WHERE username ='% u 'AND domain ='% d'

125 user_query = SELECT maildir, 666 AS uid, 666 AS gid FROM emailuser WHERE username ='% u'# query email content

5. [root@westos-mail ~] # vim / etc/dovecot/conf.d/10-mail.conf

168 first_valid_uid = 666 # Mail file query user

175 first_valid_gid = 666

30 mail_location = maildir:/home/vmail/%d/%n # email specified location

6. [root@westos-mail ~] # systemctl restart dovecot.service

Test:

[root@westos-mail] # telnet 172.25.254.113 110

Trying 172.25.254.113...

Connected to 172.25.254.113.

Escape character is'^]'.

+ OK [XCLIENT] Dovecot ready.

User lee@lee.com

+ OK

Pass lee

+ OK Logged in.

Quit

+ OK Logging out.

Connection closed by foreign host

# Shell mail #

Empty shell:

What others see is this "fake mainframe", cannon fodder.

The external display is the same as the real machine, and the message sent by others appears to be sent to it, but it is actually transferred to the real host.

1. [root@mail ~] # vim / etc/postfix/main.cf

76 myhostname = qq-mail.qq.com # hostname

83 mydomain = qq.com # domain name

99 myorigin = westos.com # the domain where the real CVM resides

116 inet_interfaces = all

119 inet_protocols = all

164By mydestination = # No mail is accepted

316 relayhost = 172.25.254.113 # forward to a real mail cloud server

2. [root@mail ~] # systemctl restart postfix.service

Test:

Sender:

[root@qq-mail ~] # mail root@westos.com

Subject: wq

five hundred and twenty one

.

EOT

[root@qq-mail ~] # mail

No mail for root

[root@qq-mail ~] # mailq

Mail queue is empty

Real email CVM:

[root@westos-mail ~] # mail

Heirloom Mail version 12.5 7-5-10. Type? For help.

"/ var/spool/mail/root": 2 messages 1 new

1 westos@westos.com Mon May 22 05:52 19amp 573 "hah"

> N 2 root Wed May 31 05:15 22 amp 724 "wq"

& 2

Message 2:

From root@westos.com Wed May 31 05:15:45 2017

Return-Path:

X-Original-To: root@westos.com

Delivered-To: root@westos.com

Date: Wed, 31 May 2017 05:15:45-0400

To: root@westos.com

Subject: wq

User-Agent: Heirloom mailx 12.5 7-5-10

Content-Type: text/plain; charset=us-ascii

From: root@westos.com (root)

Status: R

five hundred and twenty one

& Q

Held 2 messages in / var/spool/mail/root

You have mail in / var/spool/mail/root

[root@westos-mail ~] #

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