When choosing an open source SMTP server, consider the complexity of setup and configuration, customizable spam protection, integration with other applications, and developer activity. The method of configuration should also be examined carefully. Customizable filter options are important for internet use. Look for stability and developer activity for long-term use.
There are a variety of open source Simple Mail Transfer Protocol (SMTP) servers available as of 2011. An important consideration when choosing the best of the bunch is the complexity of setting up and configuring the server itself, because the process can be incredibly technical or, alternatively, it can be done completely through a graphical user interface (GUI). Next, depending on your exact use for your open source SMTP server, configurable protection from bulk email or spam can be critical to keep your server from being flooded on a daily basis.
If an open source SMTP server is to be integrated into a larger suite or application, it may be important to use a server that allows plug-ins or is configurable so that input and output can be easily routed through other applications. As open source software, the development status of the server, as well as developer activity, could also help determine the long-term viability of the software.
One of the most important and potentially frustrating aspects of using an open source SMTP server is the initial setup, customization, and configuration of the server. Some of the more popular open source servers rely completely on configuration files that need to be edited in a text editor to change or view options. Other programs give the user control through a full graphical interface so options can be set or changed with buttons, dials, or a list of valid choices. While there may not be a huge difference in the strength of the underlying SMTP server, the method the server uses to configure it should be examined carefully.
If the open source SMTP server will be used via the Internet, customizable filter options are important. These can include features such as domain name filtering, blacklisting, and authentication to prevent random users from logging in and sending mail through the server. Filters that accept regular expressions or other patterns are particularly effective, although they are not a common feature of SMTP servers in 2011.
An open source SMTP server can be used as a standalone server to process mail for a network, or it can be a single part of a larger application or server configuration. Not all SMTP servers can be easily integrated with other applications and this capability is an important one to look for if it is needed. Some open source servers support plug-ins or have source code that can be easily compiled to meet a specific request. It may also be important to look into what external programs the SMTP server requires to run, as several servers are built using other open source server utilities that will need to be installed and configured for the SMTP server to function properly.
For long-term use, it may be important to determine how active the developers of the open source SMTP server are. As technology and protocols evolve, a stagnant open source project could quickly become obsolete. At the same time, the server should be in a stage where it is stable enough that patches and fixes aren’t being rolled out on a daily basis.
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