Top 10 Spam Filters to Improve Your Email Security

spamOf the 100 emails you’ve got today, almost 80 were spam. Spam emails not only take up the space of your email storage, but also waste your time on checking and deleting them. Most importantly, they threaten the security of your email account as well as your private information. This is the reason why spam filters were created. To help you find the best one to suit your needs, we will introduce 10 spam filters that are widely used and highly recommended by their users.

Top 10 Spam Filters

MailWasher Pro-$30/year

MailWasher Pro makes it possible for you to preview all your email before getting to your PC or mobile devices. Thanks to that, you can securely read you emails and delete any suspicious or unwanted one instantly.


Integrated with Bayesian Spam Filter, SpamBully can intelligently distinguish which emails you’ve received are spam in the use of server blacklists and artificial intelligence. Also, SpamBully will ensure a good email and make it to your Inbox each time you download a email. It can be used with outlook express, outlook, Windows mail & IMAP.


SpamBayes is designed for classifying incoming email messages as “unsure”, “ham”(goo, non-spam email), or “spam”. Due to that, you are allowed to file unsure messages or spam away automatically within a different mail folder thus your email reading will be not interrupted by them.

Cactus Spam Filter—Free

As a user-friendly spam blocker, Cactus Spam Filter detects spam once it is used to protect your inbox. By tagging the subject line of emails, Cactus Spam Filter can filter spam in an efficient way.  More importantly, this solution is a fast learner that learns to detect spam as it’s being used. After a few times, it can automatically do it thus relieving you from the burden of spam.


Working between the Internet and your email client, Spamihilator is responsible for examining all incoming messages. Running in the background, Spamihilator filters all the mails that are useless or unsolicited. In order to achieve the highest possible spam recognitions rate, Spaminilator uses the Learning Filter and other filters to improve the rate up to as high as 98%, which is even better than you.

Spam Reader—Free

Spam Reader— a free anti-spam add-on for Microsoft Outlook, utilizes Bayesian algorithm—the most reliable approach, to block spam. It protects your email security by scanning every mail in an automated way and sending junk mails being detected to a different folder for further checking. Spam Reader can be used with almost all Outlook mail accounts, such as HTTP, Exchange, IMAP, and POP3.


Originally written in Perl and maintained by a group of volunteers, POPFile is a free, open source, and cross-platform mail filter. This solution filters mail by making use of a naïve Bayes classifier. Besides the typical function of filtering spam mail, POPFile also classifies all emails as per a user’s unique preferences.

SPAMfighter Pro-$15/year

To build the safest, strongest and most effective anti-spam filter in the industry, SPAMfighter has partnered up with Microsoft. For any users of Windows Mail, Outlook, Outlook Express, Thunderbird, or Windows Live Mail who want to get free from spam, SPAMfighter Pro is an ideal option for them. Once purchased it, you can benefit from many good features from this software like automatic “real time” protection, interface in multiple languages, protecting all the email accounts on the PC, moving the toolbar in Microsoft Outlook and more.


Spamato combines multiple anti-spam techniques to server thousands of users. Spamato is available as an add-on for Outlook and Thunderbird, and as a stand-alone proxy for other email clients. It supports POP3 and IMAP.


SpamExperts is a user-friendly email filtering solution allowing you to protect your email account from outgoing as well as incoming spam. The most important advantage that you can benefit from SpamExperts is the solution stores all suspicious emails in a folder called Spam Quarantine. As it works at the domain level, you are enabled to manually select a certain domain to be protected as required.

How does Spam Filter Software Work?

A filtering solution tells spam and good messages apart by using a set of protocols. In general, spam filters can be divided into several types as follows:

  • Header filters—review the header of a email to find falsified information;
  • Content filters—review a message’s content for determining if it is junk or not;
  • Rules-based filters—block spam in use of specific wording, specific senders, or other user-defined criteria applied to the subject line or body;
  • General blacklist filters—stop and delete every email coming from a blacklisted file of known spammers;
  • Permission filters—require the recipient to pre-approve the message sent by a visitor.

It is truth that no spam filter can guarantee 100% efficacy, but if you don’t have spam filtering attached to your business email system, it is hardly usable. Nowadays, many infected email attachments included in the spam emails come with compromised links, viruses, phishing attacks and more. Fortunately, for people who are running business blogs or websites, many best web hosting providers have offered them spam filter to gives an additional layer of protection to stop those malicious content from reaching their mailboxes.

How to Choose the Best Spam Filter Software?

The most significant consideration when picking a spam filter software is the ability of preventing and blocking spam reliably. And a good spam software should also support more than one email clients and webmail service providers. Below are some criteria you can use to evaluate whether a spam filter software is good or not:


If a spam filter can reliably filter and block spam, it owns the prerequisites to be a top one in the field. Likewise, many reputable spam filtering software has both white and black lists, sensitivity settings, community-based filtering, quarantine settings as well as challenge & response techniques.


A good spam filter software should be capable to protect more than one user accounts with a simple installation. In addition to that, it must have the ability to protect a user from spam emails containing viruses, worms, and attachments with any malware. If a spam filter software has the capability of identifying a HTML email that includes phishing attacks, it is considered robust.


When selecting a spam filter, you should evaluate if it is compatible with your current webmail service provider or email client. Most good spam filters support Outlook, Outlook Express, Thunderbird, and etc. Common supported webmail service providers include Yahoo!, Gmail, Hotmail, and others.

Tags: Email Filter

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