K9 Alternatives

    K9 is described as 'email filtering application that works in conjunction with your regular POP3 email program and automatically classifies incoming emails as spam (junk email) or non-spam without the need for maintaining dozens of rules or constant updates to be downloaded'. There are more than 10 alternatives to K9 for a variety of platforms, including Windows, Linux, Mac, Microsoft Office Outlook and Thunderbird. The best alternative is Mailwasher, which is free. Other great apps like K9 are POPFile (Free, Open Source), SPAMfighter (Freemium), SpamSieve (Paid) and Spamihilator (Free).

    This page was last updated Jan 29, 2020

      • FreemiumProprietary
      • Windows
      • Linux
      Over 8 million people use MailWasher as their spam filter Introducing MailWasher, the leader in spam filter software, and the easiest way to check and manage your e-mails before you download them.
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      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      POPFile classifies email into categories you define. It can sort into spam and not spam or into any number of categories you like (e.g. work, personal, important project, hobby, etc.).
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    1. SPAMfighter is a free spam filter for Microsoft Outlook, Outlook Express, Thunderbird, Windows Mail and Windows Live Mail, that automatically and efficiently filters spam. Install SPAMfighter now and be spam free in 2 minutes.
    2. Save time by adding powerful spam filtering to the e-mail client on your Mac. One of the only standalone spam filtering softwares for Mac.
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      • FreeProprietary
      • Windows
      Spamihilator works between your E-Mail client and the Internet and examines every incoming E-Mail. Useless spam mails (Junk) will be filtered out. This process runs completely in the background.
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      • FreeProprietary
      • Windows
      • Microsoft Office Outlook
      • Thunderbird
      Most people find spam e-mails the biggest nuisance on the Internet. Today, spam e-mails account for over 80% of all e-mail traffic and their volumes increase daily. Strike back with BullGuard Spamfilter.

      Discontinued

      BullGuard Spamfilter was discontinued on 12 July 2013. The product is no longer available on the official website.

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      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      Spamato is a spam filter system that combines several anti-spam techniques, from which thousands of users benefit. It is available as an add-on for Thunderbird and Outlook, and as a stand-alone proxy for other email clients. IMAP and POP are supported.

      Discontinued

      The project is no longer developed. Last version, 0.99.9, released in August 2007, can be still downloaded from SourceForge.

      • FreemiumProprietary
      • Windows
      Spam Reader is a free anti-spam add-on for Microsoft Outlook. The software uses the most reliable approach to block junk emails - Bayesian algorithm based on statistical analysis, capable to be adjusted to user's needs and detect up to 98% of spam messages.
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      • FreeOpen Source
      • Mac
      • Windows
      • Linux
      • IncrediMail
      • Microsoft Office Outlook
      • Thunderbird
      • Microsoft Outlook Express
      • Windows Live Mail
      The SpamBayes project is working on developing a statistical (commonly, although a little inaccurately, referred to as Bayesian) anti-spam filter, initially based on the work of Paul Graham.
      • Software as a Service (SaaS)
      The leading solution to protect your business and your employees from new threats by email: malware, phishing, ransomware, spam, etc. Opt for security at your fingertips and convenience on a day-to-day basis!
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    Showing 10 of 10 alternatives