The configuration of postfix virtual user under Linux

1. Establish a virtual user database

[Root@mail ~] #service mysqld Restart//restart MySQL database

[Root@mail ~] #tar zxf extman-0.2.5.tar.gz

[Root@mail ~] #cd Extman-0.2.5/docs

[Root@mail docs] #mysql-u root-p123456 < extmail.sql//import extmail.sql script, root login database password 123456

[Root@mail docs] #mysql-u root-p123456 < init.sql//import Init.sql Script

The main database operations that the Extmail.sql script completes are as follows:

Create a database named Extmail and some tables in the library;

Establish the database user extmail@localhost, the initial password is extmail, the table in the database extmail has select, UPDATE permission;

Establish the database user webman@localhost, the initial password is Extman, the table in the database extmail has SELECT, INSERT, delete, update permissions.

The main database operations that the Init.sql script completes are as follows:

Initialize database extmail;

Establish a virtual mail domain named extmail.org;

Establish the database user root@extmail.org, the initial password is: extmail*123*, as the mail domain management account;

Set up the database user postmaster@extmail.org, the initial password is: Extmail, as the basic mail user.

2. Modify the configuration of the Postfix

[Root@mail docs] #vi/etc/postfix/main.cf

The configurations that support virtual users are:

Virtual_mailbox_base: Specifies the path start of the virtual mailbox store directory

Virtual_alias_maps: Specifies the alias file location for the virtual mail user

Virtual_mailbox_maps: Map Location of virtual mailbox address and storage location

Virtual_mailbox_domains: Domain Name

Virtual_uid_maps: Set the UID number of the local user mapping for the virtual mail user

Virtual_gid_maps: Set the GID number of the local group for the virtual Mail user map

3. Set SMTP letter authentication for virtual users:

1>. Compile Installation Courier-authlib Package:

[Root@mail ~] #tar jxf courier-authlib-0.60.2.tar.bz2

[Root@mail ~] #cd courier-authlib-0.60.2

[Root@mail courier-authlib-0.60.2]#./configure--prefix=/usr/local/courier-authlib--without-stdheaderdir-- With-authmysql--with-redhat--with-mysql-libs=/usr/local/mysql/lib/mysql--with-mysql-includes=/usr/local/mysql/ Include/mysql

[Root@mail courier-authlib-0.60.2] #make && make install

[Root@mail courier-authlib-0.60.2] #make install-configure

2> Modify the Courier-authlib related configuration and start the service:

Add the Courier-authlib library file path to the system's search path:

[Root@mail courier-authlib-0.60.2] #vi/etc/ld.so.conf

/usr/local/courier-authlib/lib/courier-authlib

[Root@mail courier-authlib-0.60.2] #ldconfig

Modify the AUTHDAEMONRC master configuration file, leaving only the Authmysql authentication method and removing other methods:

[Root@mail courier-authlib-0.60.2] #cd/usr/local/courier-authlib/etc/authlib

[Root@mail Authlib] #vi AUTHDAEMONRC

authmodulelist= "Authmysql"//configuration items that need to be modified

authmodulelistorig= "Authmysql"//configuration items that need to be modified

[Root@mail Authlib] #chmod-R 755/usr/local/courier-authlib/var/spool/authdaemon

Modify the AUTHMYSQLRC file to describe how to query the MySQL database for information:

[Root@mail Authlib] #vi AUTHMYSQLRC

mysql_server localhost \\MSYQL database server location

Mysql_username extmail \ Database Administrator account

Mysql_password extmail \ Database Administrator account password

Mysql_socket/tmp/mysql.sock \\mysql.sock File Location

Mysql_database extmail \ Virtual User Database

Mysql_user_table mailbox \ Heavy Mailbox table to obtain account information

Mysql_crypt_pwfield password \ Get account password from Pssword field

Mysql_uid_field uidnumber \ \ Obtains a mapped local user UID from the Uidnumber field

Mysql_gid_field gidnumber \ \ Get mapped local group GID from the Gidnumber field

Mysql_login_field username \ Get account name (with @ suffix) from username field

Mysql_home_field concat ('/mailbox/', homedir) \ \ Merge The full path of the user's host directory

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Mysql_name_field name \ \ Get account names from the Name field (without the @ suffix)

Mysql_maildir_field concat ('/mailbox/', MAILDIR) \ \ Merge The user's full message store path

Copy the Courier-authlib script and start the Courier-authlib service:

[Root@mail Authlib] #cp courier-authlib.sysvinit/etc/init.d/courier-authlib// Courier-authlib.sysvinit files are located in the courier-authlib-0.60.2 directory after the source package is uncompressed

[Root@mail Authlib] #chmod 755/etc/rc.d/init.d/courier-authlib

[Root@mail Authlib] #service courier-authlib start

[Root@mail Authlib] #chkconfig--level courier-authlib on

3> modify Cyrus SASL settings: (Modify the Smtpd.conf file, which was established when building a system based user's mail system, and now change the authentication mode to Authdaemond, i.e. courier-authlib)

[Root@mail Authlib] #vi/usr/lib/sasl2/smtpd.conf

Pwcheck_method:authdaemond

Authdaemond_path:/usr/local/courier-authlib/var/spool/authdaemon/socket

4. Modify the configuration of the Dovecot:

The configuration of the 1>.dovecot file needs to be modified as follows:

[Root@mail ~]# vi/etc/dovecot.conf

Find mail_location change it to

Mail_location = Maildir:/mailbox/%d/%n/maildir

Find mechanisms = Plain Add the following below

Passdb SQL {

args =/etc/dovecot-mysql.conf

}

UserDB SQL {

args =/etc/dovecot-mysql.conf

}

2> Establish a database query configuration file:

[Root@mail ~]# vi/etc/dovecot-mysql.conf

Driver = MySQL

Connect = host=localhost dbname=extmail user=extmail password=extmail

Default_pass_scheme = encryption algorithm for cipher string stored in CRYPT \\MSYQL database

Password_query = SELECT username as user,password as password from mailbox WHERE username = '%u ' \ SQL statements for querying user passwords

User_query = SELECT Maildir, uidnumber as UID, gidnumber as GID from mailbox WHERE username = '%u ' \ \ SQL statements for querying users

3> Set up a virtual user postmaster@extmail.org mailbox directory, adjust permissions, and start the Dovecot service:

[Root@mail ~] #mkdir-P/mailbox/extmial.org/postmaster/maildir

[Root@mail ~] #chown-R Postfix:postfix/mailbox

[Root@mail Maildir] #killall-9 dovecot//If Dovecot service is started, perform this step first

[Root@mail Maildir] #dovecot

5. Test virtual User Implementation results:

1> Testing the Authlib service, you will see the authentication succeeded message if the previous configuration has not been wrong:

[Root@mail ~]#/usr/local/courier-authlib/sbin/authtest-s Login postmaster@extmail.org extmail

2>. Test the SMTP letter authentication for the virtual user, the "235 Authentication successful" message indicates success

[Root@mail ~]# perl-e ' use mime::base64; Print Encode_base64 ("Postmaster\ @extmail. org") '

[Root@mail ~]# perl-e ' use mime::base64; Print encode_base64 ("Extmail")