The SMTP protocol is a protocol used for the exchange of information via an Internet connection. In this protocol a remote server provides some or all of the following services: authentication, authorization, and message delivery. SMTP Server Software is the application program that runs on the Windows operating system. It usually does some authentication of incoming messages and passes them to another program which serves as a Web Server application and transmits the message to the remote server.
This type of software is referred to as a Free SMTP Server because it is available for free. Free software is normally open source and its source code is available to anyone. The main disadvantage of free software is that it can be hard to understand how the application works. Free software can sometimes be overly complicated for the average user. Another disadvantage of free software is that they may have vulnerabilities. Some free programs are known to not work on certain versions of Microsoft's Windows operating system. If you're looking for a free application that supports all versions of Windows, you'll need to look for a reseller.
If you do choose to download a reseller application, the reseller may also offer a range of other applications including some free software. You can also get access to other types of software, if you buy a bundle of these applications. This type of software usually comes with web servers and can handle both personal and business emails. Most applications used by resellers are free versions of a paid application. The reseller will offer you a free version that functions like a regular application. But in order to download it, you'll need to pay a nominal fee. Sometimes, the fee is included in the price of the application.