Anti-spam appliances are hardware apparatuses that utilize onboard anti-spam and anti-spim (the spam equivalent for instant messengers) software in a physical device platform. They could either be positioned at the gateway or front of the mail server or used as inbox filters depending on your preference and their capabilities. These products are usually part of a comprehensive collection of tools and applications that are precision engineered to not only combat the annoyances of unsolicited junk mail, but also the many dangers of the worldwide web.
UTM software suites and units that are capable of fighting spam, viruses, worms, trojans, phishing, exploits, botnets, and so on usually include anti-spam functions in their features. Conversely, there are also appliances and programs that are exclusively made for anti-spam purposes. At any rate, hardware-based anti-spam solutions have the added advantage of being useable even after the machine, application, or operating system that you use to get your email with has already been compromised, which is why this particular service is more popular with corporations than with individual users.
The main consumer base for anti-spam appliances are usually composed of Internet service providers, multinational companies, universities, small businesses, nonprofit organizations, government agencies, and the like. Moreover, when shopping for the best anti-spam appliances available, it's always prudent to look for brands that partner up with popular platforms such as Apple and Microsoft to assure hardware compatibility with your respective PC. The most powerful, most secure, and most dependable anti-spam appliances in the market today usually support programs such as Thunderbird, Windows Mail, Outlook Express, and Outlook as well as corporate-funded local network setups.
You should also look for anti-spam devices that will automatically test new email whether on the server level or inbox level—preferably both, if possible. Even though a lot of free webmail providers are already employing their own stringent anti-spam policies that move unsolicited messages to your spam folder to delete or mark of as valid mail at your behest, only a fully customizable product like an anti-spam appliance will allow you enough control to avoid the accidental removal of legitimate messages. When it comes to fighting spam, it's important for you to draw a line between overly strict spam removal and ineffective anti-spam policies, and the best anti-spam appliances out there give you the power to do just that.