How to set up Clam Antivirus, SpamAssassin and MailScanner on Ubuntu mail server

Antivirus and anti-spam protection are the among the most important security features for a mail server. Unix/Linux based mail servers are typically invulnerable to malware and viruses, and there is a very slim chance that the server itself may get infected. On the other hand, the operating system of an end user device may not […]
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How to set up RainLoop webmail in Ubuntu server

Webmail is undoubtedly an essential part of any mail server. While native email client software has typically more features compared to webmail services, accessing IMAP or SMTP server ports via an email client from outside of the trusted network can sometimes be tricky. Moreover, while you need a designated workstation, laptop, or mobile device to […]
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How to configure SNMPv3 in Ubuntu, CentOS and Cisco

Simple Network Management Protocol (SNMP) is a widely used protocol for gathering information about what is going on within a device. For example, CPU and RAM usage, load on a server, traffic status in a network interface, and many other interesting properties of a device can be queried using SNMP. Currently, three versions of SNMP […]
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How to set up a secure Apache webserver on Ubuntu

This tutorial assumes that you have a running Ubuntu Server, that networking has been set up, and that you have ssh access. Apache2 is the default webserver used by many Linux installations. It is not the only one available, or the best for all circumstances, but it covers many usage scenarios. During the installation, you […]
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How to speed up slow apt-get install on Debian or Ubuntu

If you feel that package installation by apt-get or aptitude is often too slow on your Debian or Ubuntu system, there are several ways to improve the situation. Have you considered switching default mirror sites being used? Have you checked the upstream bandwidth of your Internet connection to see if that is the bottleneck? Nothing […]
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What are things to do after installing Ubuntu 13.10?

Ubuntu 13.10 (code-named “Saucy Salamander”) was launched on 17 October 2013, with all the latest goodies inside. Once you download and install it on your computer, what are the things to do next? In other words, what are the essential or useful apps to install? In this article, I will share my experience with the […]
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How to PGP encrypt, decrypt or digitally sign files via GnuPG GUI

Pretty Good Privacy (PGP) is an encryption/decryption program that provides cryptographic privacy and authentication for data communication. PGP is popularly used to digitally sign, encrypt or decrypt email messages or files being transferred over the Internet. In Linux, there exists GnuPG, a GPL-licensed alternative to PGP. While it is possible to use GnuPG to encrypt […]
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How to password protect a folder or directory on Linux

Suppose you have a folder in your Linux home directory, where you store secure document files which you do not want anyone to access without a password. That way, even if someone manages to get a hold of your computer and access your home directory, there is still another line of defense for your private […]
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