In this guide you will learn how to install and configure SquirrelMail step by step in Centos 7 and RHEL 7.

Step 1: First of all disable SELINUX using below command

this is not the best choice to disable the firewall because of security purposes, but we are doing this locally. in your case you allow the traffic vie the firewall-cmd rules.

# vi /etc/selinux/config

set SELINUX=disabled

save changes to file and quite

and reboot the server using below command

# reboot

Step 2: Install and Configure Postfix

You must install Epel Repository using below command

# yum install epel-release -y

Now install Postfix

# yum install postfix -y

Now make following changes to posfix file using below command at the end.

# vi /etc/postfix/main.cf

## Enter your hostname
myhostname = osradar.localhost.local

## Enter your domain name
mydomain = osradar.localhost.local

inet_interfaces = all
myorigin = $mydomain

##set your IP range
mynetworks = 192.168.130.138/24, 127.0.0.0/8

## set your mail direcotry
home_mailbox = Maildir/

## Now Go to line no 164 add $domain at the end
mydestination = $myhostname, localhost.$mydomain, localhost, $mydomain

save changes to file and quite

Restart Postfix

# systemctl restart postfix

# systemctl enable postfix

Step 3: Install and Configure Dovecot

# yum install dovecot

# systemctl start dovecot

# systemctl enable dovecot

Now modify below files one by one

make following changes at the end of file /etc/dovecot/dovecot.conf

# vi /etc/dovecot/dovecot.conf

protocols = imap pop3 lmtp

make following changes at the end of file /etc/dovecot/conf.d/10-mail.conf

# vi /etc/dovecot/conf.d/10-mail.conf

mail_location = maildir:~/Maildir

make following changes at the end of file /etc/dovecot/conf.d/10-auth.conf

# vi /etc/dovecot/conf.d/10-auth.conf

disable_plaintext_auth = yes
auth_mechanisms = plain login

make following changes to file /etc/dovecot/conf.d/10-master.conf

# vi /etc/dovecot/conf.d/10-master.conf

unix_listener auth-userdb {
#mode = 0600
user = postfix ## uncomment line 91 and enter postfix
group = postfix ## uncomment line 92 and enter postfix

Now restart Dovecot

# systemctl restart dovecot

# systemctl enable dovecot

Step 4: Install and Configure Squirrelmail

First install and start apache service

# yum install httpd -y

# systemctl start httpd

# systemctl enable httpd

Now install Squirrelmail

# yum install squirrelmail -y

Now go to squirrelmail folder and configure it according to your server

# cd /usr/share/squirrelmail/config/

# ./conf.pl

After changes press S to save settings and press Q to exit.

Now add following lines at the end of httpd.conf file.

Note: If these lines are already added at the end of file SKIP this step.

# vi /etc/httpd/conf/httpd.conf

Alias /webmail /usr/share/squirrelmail
<Directory /usr/share/squirrelmail>
Options Indexes FollowSymLinks
RewriteEngine On
AllowOverride All
DirectoryIndex index.php
Order allow,deny
Allow from all
</Directory>

save changes and quite

then restart Apache and dovecot service

# systemctl restart httpd

# systemctl restart dovecot

Step 5: Create User and Access Webmail

# adduser osradar

# passwd osradar

Finally access Webmail

http://server-ip/webmail

OR

http://yourdomainname/webmail

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Major features

An interesting feature is Wayland support. Wayland is intended as a better and simpler replacement for the widely used X server that’s responsible for the visual interface of Linux. This new replacement is targeting simplicity, easier to develop and maintain. It’s written in C and we can expect that GNOME & KDE, 2 mainstream desktop environment will be ported to it. In RHEL 7.5, Wayland support in GNOME is present as the tech preview. It’s confirmed by the 7.5 release notes.

With this implementation, we’re expecting that Red Hat Enterprise Linux 8.0 will offer a GNOME Wayland session by default. However, it’s not too surprising as RHEL is providing the support with several latest releases. The GNOME Wayland experience is continuing further refining but yet to prove as very solid. Red Hat also wishes for supporting Mutter EGLStreams code for NVIDIA Linux driver support.

Alongside other updates, Red Hat Linux Enterprise (RHEL) comes up with initial Heterogeneous Memory Management (HMM) support in the kernel. You can enable the feature with “experimental_hmm=enable”. RHEL 7.5 beta implements “kexec” system call and its fast reboot capability, KASLR address space layout randomization is also in the form of tech review.g

Additional features

Other key features include –

• Security improvements – more securely unlocking Network Bound Disk Encrypted devices during boot.
• Integrated Red Hat Ansible DevOps Automation with OpenSCAP – easier to automate compliance issue remediation. Admins can reliably and efficiently scale policies across servers and clouds.
• Compliance improvements with PTP (Precision Time Protocol) and NTP (Network Time Protocol).
• Easier-to-use admin console Cockpit – easier system management covering almost everything.
• Ability to auto-generate a “know-good” bootable snapshot. This feature allows faster recovery and rollback after patching.
• VDO (Virtual Data Optimizer) to reduce data redundancy through inline compression and deduplication. According to Red Hat, VDO can increase effective capacity by up to 6 times.

These awesome features are in testing phase but expected to come out with the next stable release. The codes are refining and evolving. Feel free to check out the beta. You can download Red Hat Enterprise Linux here. If you’re looking for a personal & powerful Linux distros, check out our top 10 Linux distros.

The post RHEL 7.5 Beta is Out – New Features & Expectations appeared first on Linux Windows and android Tutorials.