Courier

Courier is a completely free and open-source mail transfer agent (MTA) that works on different platforms. It’s like an all-in-one mail and groupware server built on common protocols, including IMAP, POP3, SSL, LDAP, ESMTP, and HTTP. Pretty cool, right?

What Makes Courier Stand Out?

This software is super powerful and mature! It offers webmail and mailing list services all in one easy-to-use package by utilizing ESMTP, IMAP, and POP3 protocols.

Flexibility with Separate Packages

The best part? Courier allows you to use its mail filtering engine, IMAP server, and webmail server as separate packages. This means you can easily install them and mix them up with other mail server apps without any hassle.

Installing Courier on GNU/Linux

If you're looking to install Courier, it's a piece of cake! Just grab the latest release from Softpedia and save it in your Home directory. Once that's done, unpack the archive.

Next up, open your Terminal app and navigate to where you extracted the files (like cd /home/softpedia/courier-0.74.1). From there, type in ./configure && make to set it up. If everything goes smoothly during compilation, you'll run sudo make install for the final installation step.

Create Directories During Installation

During the setup process, you'll need to create directories for the web-based admin tool and an SSL certificate. Don't worry; there are several config files hanging out in the /etc/courier folder for your convenience!

A Peek Under the Hood of Courier

If you're curious about what powers Courier—it's written using C++, C, and Perl programming languages! Plus, it's compatible with both 32-bit and 64-bit systems. You'll find that it runs as a non-interactive daemon too—perfect for deployment on any GNU/Linux or BSD machine.