Book Image

Ubuntu Server Essentials

By : Abdelmonam Kouka
Book Image

Ubuntu Server Essentials

By: Abdelmonam Kouka

Overview of this book

Ubuntu is a Debian-based Linux operating system built on top of the Debian architecture. It is used to make operating systems for multiple platforms, including phones, desktops, TVs and mobiles. It has made some serious progress in the realms of efficiency and user friendliness. With evolving technology trends, demands on software have changed, with more and more skilled users. Over the past few years, services such as Facebook, Twitter, and push notifications on smartphones mean that users are used to being up to date with everything that happens all the time. With SignalR, the applications stay connected and will generate notifications when something happens either from the system or by other users. This provides new opportunities for the system administrators, to enter this new and exciting world of real-time application development. This is a concise and a cost-friendly guide, packed with up-to-date essentials on Ubuntu Server fundamentals. It will guide you through deploying and configuring Ubuntu servers in your office environments. You’ll start by installing Ubuntu Server, then move to the most useful aspect —the command-line interface inside it. You’ll extend your knowledge by learning how to administrate and configure Ubuntu Server. You will also see how to deploy services on Ubuntu Server and find out how to secure it. You’ll get to grips with the virtualization and cloud computing facilities provided by Ubuntu, and finally, you’ll gain some very useful tips.
Table of Contents (13 chapters)

Filters and security for an e-mail server

Today, Unsolicited Bulk Email (UBE) represents one of the largest problems for e-mail servers. Also known as spam, such messages may also carry viruses and other forms of malware. To handle this issue, there are a lot of powerful utilities that can be installed on an Ubuntu Server and integrated with an e-mail server. The following is a list of the best utilities:

  • Amavisd-new is a generic scanner program. Its role is to call a certain number of content filtering tools such as antivirus, spam detection, and so on. You can install it by using the following command:

    sudo apt-get install amavisd-new.

    To configure it, you have to first of all activate antivirus and anti-spam detection in Amavisd-new by editing the /etc/amavis/conf.d/15-content_filter_mode file and uncommenting some lines, as described in the file itself. To customize Amavisd-new, you can edit options in the config files under the /etc/amavis/conf.d/ directory. Don't forget to restart...