How to create a mail system based on a virtual account

Create a mail system based on a virtual account, as shown in the following figure:

As shown in the image above: the client login mail system needs to be authenticated by the CYRUS-SASL function library account, but CYRUS-SASL cannot call MySQL, so courier-authlib must be installed to invoke MySQL.

Use Dovecot to receive when sending a message. Extmail provides a way for users to receive or send messages in a Web interface. Extman is a web interface that provides management for administrators.

Postfix default can not support the MySQL database, so you must use the source code to install Postfix

Modify Host Name:

[Root@lyt ~]# Vim/etc/sysconfig/network

[Root@lyt ~]# vim/etc/hosts

[Root@lyt named]# Init 6 #重启 to take effect on the newly established host name

[Root@lyt ~]# Vim/etc/yum.repos.d/rhel-debuginfo.repo #编辑本地yum

To build a DNS server:

[Root@lyt ~]# Mkdir/mnt/cdrom

[Root@lyt ~]# mount/dev/cdrom/mnt/cdrom/

[Root@lyt ~]# cd/mnt/cdrom/server/

[Root@lyt server]# Yum Install bind-y

[Root@lyt server]# Yum Install bind-chroot-y

[Root@lyt server]# Yum Install caching-y

[Root@lyt server]# Yum Install caching-nameserver-y

[Root@lyt server]# cd/var/named/chroot/etc/

[Root@lyt etc]# cp-p named.caching-nameserver.conf named.conf

[Root@lyt etc]# Vim named.conf