The increasing demand for spam filters amongst Internet surfers has made it imperative for the software developers to make and offer highly user-friendly and effective spam filters, free of cost.

The World Wide Web is deluged with spam filters which can be downloaded free of cost and do not require any additional software or hardware support. However, the user needs to keep certain guidelines in mind while downloading spam filters. One needs to check with their Internet service provider, as most ISPs offer some kind of spam filter. Also, the spam filter must be compatible with the email program installed in the system, as well as with the Internet mail provider.

Most of the software giants offer free spam filters which are highly compatible with their email services. Most of these spam filters are built into the mail service. Microsoft,

Symantec, McAfee, Allume, Mailshell, SpamFighter, Blue Squirrel, Firetrust, SpamBully, and Cloudmark are some of the preeminent spam-filter makers.

Locating and identifying the most suitable spam filter may prove to be a tedious task for a novice. There are innumerable websites and online information resources which discuss spam filters at length and offer apt guidance for choosing the best and the most suitable one.

Spam filters are an immensely popular way to block unsolicited mails. However, practicing ethical online behavior and being cautious while exchanging emails plays a vital role in barring spam as well. One needs to clearly identify and categorize his mailing lists as personal or professional. It is advisable not to send too many personal emails or chain mails, to avoid attracting spammers. A bit of caution coupled with spam filter technology can prove to be very effective in controlling spam circulation on the Internet.