How to configure Postfix to send mail via Google Apps

In this tutorial, we’ll configure Postfix to send an email through Google’s SMTP on Ubuntu 12.04 LTS Server for Google Apps. We can use the exact same setup for Gmail account also:

Install Postfix and command line mail utility using the following command:

sudo apt-get install postfix mailutils

How to install the RPM Package on Ubuntu

Ubuntu is an excellent Operating System and we can find almost any package through Software Centers or PPA but sometime the software is not available in deb/ppa but only in rpm format than we can convert the rpm file into deb format very easily using one command.

Let’s check that unison package is install or not:

unison -version

Suppose, we have unison package in rpm format only 😦

ls

OpenVPN server on Ubuntu 12.04 behind NAT

This tutorial describes that how to configure the OpenVPN Server in Ubuntu and clients in Windows XP/7.

I am taking the scenario of SOHO network, which is protected by Firewall, we’ll implement the OpenVPN on internal Ubuntu server to access the internal SOHO network (Server and PCs) through the internet from anywhere securely.

OpenVPN Server Installation:

Install the openvpn package using the following command:

 sudo apt-get install openvpn

On Ubuntu 14.04 LTS, please use the following command to install the openvpn package:

sudo apt-get install openvpn easy-rsa