SquirrelMail for webmail

Linux
Linux is an open-source software operating systems
built around the Linux kernel. Linux is developed by
Linus Torvalds.
It was his project in 1991 which he took himself for
personal enhancement of skills.
The first version of Linux was introduced on
September 17, 1991, and it is developed in GNU/GPL public license.
Some of the most popular and mainstream Linux distributions are Arch
Linux, CentOS, Debian and Raspbian, Fedora, Gentoo Linux, Linux Mint,
Mageia, openSUSE, Ubuntu and so on.

What is Webmail?
 Webmail provides a web-based (HTTP) Mail User Agent
(Front-end) to access emails.
 This makes webmail available anywhere which is practical
for most users.
 Use the default HTTP port 80 but can ran on other users
defined ports.
 Webmail systems will access the mail server using
IMAP4(s), POP3(s). Some read the files directly from the
mailbox stored in Maildir format e.g Squirrelmail.

System Architecture of Mail Server
MUA – Mail User Agent UDP – User Datagram Protocol
MTA – Mail Transport Agent SMTP – Simple Mail Transfer Protocol
DNS – Domain Name Server POP – Post Office Protocol
IMAP – Intenet Mail Access Protocol

SquirrelMail
Started in 1998 by two brothers Luke and Nathan Ehresman.
It supports IMAP and SMTP protocols and can be set up to
support a wide range of MTA and implementations.
Continues to have features support in plugins including
password change and server-side filters.
It has a light interface because it’s written in PHP.

Pre-requirements
To configure SquirrelMail the pre-requirements are-
 SMTP server(Postfix)
Web server(HTTP)
DNS server(BIND)
Dovecot server

SMTP Server
SMTP stands for Simple Mail Transfer Protocol.
The package used is Postfix. By default, Sendmail (/usr/sbin/sendmail) is
the default SMTP program under Red Hat Enterprise Linux.
However, a simpler mail server application called Postfix (/usr/sbin/postfix)
is also available.
Configuring Postfix to accept network connections from hosts other than
the local computer takes only a few minor changes in its configuration file.
Yet for those with more complex needs, Postfix provides a variety of
configuration options, as well as third party add ons that make it a very
versatile and full-featured MTA(Mail Transport Agent).

Configure Postfix
[root@server ~]# yum install postfix
[root@server ~]# vim /etc/postfix/main.cf
myhostname = www.aryman.com ##line no 75 ‐ uncomment and enter
your host name
mydomain = aryman.com ##line no 83 ‐ uncomment and enter your domain
name
myorigin = $mydomain ##line no 99 ‐ uncomment
inet_interfaces = all ##line no 116 ‐ change to all
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain #
#line no 164 ‐ add $domain at the end
mynetworks = 192.168.1.200/24, 127.0.0.0/8 ##line no 264 ‐ uncomment and
add your network range
home_mailbox = Maildir/ ##line no 419 ‐ uncomment
[root@server ~]# systemctl start postfix
[root@server ~]# systemctl enable postfix

Web Server
Linux uses the Apache HTTP Server (http://httpd.apache.org/)
for hosting websites. Apache itself does not operate with
websites; it manages virtual hosts, that is web resources
identified either by an IP address or a hostname.
The file /etc/httpd/conf/httpd.conf defines Apache
configuration for all virtual hosts in the system.
fig.
The hierarchy of
web server settings

Configure HTTP Server
[root@server ~]# mv squirrelmail /var/www/html
[root@server ~]# cd /var/www/html/squirrelmail/
[root@server ~]# chown –R apache:apache squirrelmail
[root@server ~]# vim /etc/httpd/conf/httpd.conf
<Directory /var/www/html/squirrelmail>
Options Indexes FollowSymLinks
RewriteEngine On
AllowOverride All
DirectoryIndex index.php
Order allow,deny
Allow from all
</Directory>
[root@server ~]# systemctl restart httpd
[root@server ~]# systemctl enable httpd
Copy all the files of SquirrelMail in /var/www/html/ directory

DNS Server
DNS stands for Domain Name Server. DNS is also know
as nameserver.
DNS associates hostnames with their respective IP addresses,
so that when users want to connect to other machines on
the network, they can refer to them by name, without having to
remember IP addresses.
The package is used to configure DNS is
BIND(Berkeley Internet Name Domain).

Configure DNS
BIND stores its configuration files in the following locations:/etc/named.conf
[root@server ~]# yum install bind
[root@server ~]# vim /etc/named.conf
[root@server ~]# systemctl start named
[root@server ~]# systemctl enable named

Dovecot Server
Dovecot is an open source IMAP and POP3 server for
Linux/UNIX-like systems, written primarily with security in mind.
The primary purpose of dovecot is to act as mail storage server.
The imap-login and pop3-login daemons which implement the
IMAP and POP3 protocols are included in the dovecot package.
The use of IMAP and POP is configured through dovecot; by
default dovecot runs only IMAP.

Configure Dovecot
[root@server ~]# vim /etc/dovecot/dovecot.conf
protocols = imap pop3 lmtp
[root@server ~]# vim /etc/dovecot/conf.d/10‐mail.conf
mail_location = maildir:~/Maildir ##line no 24 ‐ uncomment
[root@server ~]# vim /etc/dovecot/conf.d/10‐auth.conf
disable_plaintext_auth = no ##line no 9 ‐ uncomment and change from yes to no.
auth_mechanisms = plain login ##line no 97 ‐ add the text "login“
[root@server ~]# vim /etc/dovecot/conf.d/10-master.conf
unix_listener auth‐userdb {
#mode = 0600
user = postfix ##line no 83 ‐ uncomment and enter postfix
group = postfix ##line no 84 ‐ uncomment and enter postfix
[root@server ~]# systemctl start dovecot
[root@server ~]# systemctl enable dovecot

Configuring SquirrelMail
SquirrelMail has its own configure options
[root@server ~]# cd /var/www/html/Squirrelmail/config/
[root@server ~]# ./conf.pl

 set organization details by select 1 option in conf.pl

 set general server details by select 2 option in conf.pl

 Open Web Browser
[root@server ~]# firefox http://www.aryman.com/squirrelmail
or
[root@server ~]# firefox http://192.168.1.200/squirrelmail

The front end of SquirrelMail

 Login by “Gautam” user.

 The inbox of “Gautam” user

 compose a mail and sent to “shubham” user.

 receive a mail from “gautam” user.

 reply mail from “shubham” user to “gautam” user.

SquirrelMail for webmail

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SquirrelMail for webmail