Best free anti spam software

Martin Brinkmann
Nov 7, 2005
Updated • Mar 14, 2014

I have been using Spamihilator for the last two years and can only say that this is the best free anti spam software that I have ever used. And believe me, I tried a lot. Before i used the software I received approximately 500 spam mails per day, mainly due to published emails on websites that I own.

I searched desperately for a good anti spam software and tried many. Many that I tried did not reduce the spam count enough to justify their use, others caused lots of false positives which flagged legitimate emails as spam.

Then, finally after a long evaluation period I found the spam software that I'm still using today. It reduced my daily spam amount from 500 to 4 in just two days.

Spamihilator "sits" between your mail client and the email server, and analyzes every single email that flows through it.

If the program believes that a mail is spam, it moves it to the trashcan and the training area.The training area is important, as you use it to teach the program to make it better.

It is highly suggested to use the training area for at least the first work of operating Spamihilator to make sure that no legitimate emails land in the trashcan folder. You can also add email addresses to a whitelist so that they will never be flagged as spam regardless of contents. This can be useful to make 100% sure that mails from select recipients arrive in your inbox and are not interrupted by the spam checker.


If there is a whitelist there's also a blacklist, you can add emails to the blacklist so that they are always flagged as spam and moved to the trash automatically as a consequence.

The training area helps to increase distinguishing chance of the spam software, you can select every mail and define it as spam or not. The program learns from your actions here and will improve its spam detecting algorithm further based on that.

The amount of spam mails I received remained steady the same, but the amount that arrived at my mailbox was reduced by an astonishing 98% after just two days of using the spam program.

Spamihilator already has some good spam checking algorithm which gets better by using the training area but there are also lots of plugins which mostly serve a special spam type. Lets take a look at some of the most important plugins.

  • Addressee Filter: Quickly filters out mails that are not addressed To or Cc'd to one of your correct email addresses.
  • AlphabetSoup Filter 1.0: This plugin filters emails containing useless chains of characters.
  • Empty Mail Filter v1.0.2 : This filter blocks e-mails that are empty or contain very few words.
  • No Comment! Filter v1.0.0: This filter blocks e-mails that contain HTML comments. Spammers sometimes use HTML comments.
  • RFC-Validator 1.2.0: Filters mails that are not RFC conform or malicious
  • Scripts Filter v1.0.2: This filter blocks e-mails that contain embedded HTML scripts.
  • S_P_A_C_E Filter: Eliminates e-mails containing spaced-out words like `v 1.a g-r a` or `v.i c.0~d.i_n`.

There are lots more, all can be downloaded from the official homepage.


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  1. JMGG said on January 19, 2012 at 8:25 am

    You said that Outlook isn’t your main email client, so which is your main one?

    1. BalaC said on January 19, 2012 at 9:42 am

      I think its thunderbird

    2. Martin Brinkmann said on January 19, 2012 at 10:15 am

      It is Mozilla Thunderbird.

  2. Salaam said on September 24, 2012 at 9:52 pm

    Awesome! This actually solved my problem… what a stupid bug.

  3. Claud said on December 19, 2012 at 2:08 am

    If this is the same bug that I’ve encountered, there may be another fix: (1) hover over open Outlook item in Taskbar, cursor up to hover over Outlook window item, and right-click; (2) this should give you Restore / Move / Size / Minimize / Maximize — choose Move or Size; (3) use your cursor keys, going arbitrarily N/S/E/W, to try to move or size the Outlook window back into view. Basically, the app behaves as though it were open in a 0x0 window, or at a location that’s offscreen, and this will frequently work to resize and/or move the window. Don’t forget to close while resized/moved, so that Outlook remembers the size/position for next time.

    1. Lynda said on February 12, 2013 at 3:37 pm

      THANK YOU Claude!!! I could get the main window to launch but could not get any other message window to show on the desktop. You are my hero!!!!

    2. Chad said on November 20, 2018 at 4:24 pm

      Solved my issue! 6 years later and this is still problem…

    3. Ivan X said on January 21, 2021 at 4:50 pm

      Fantastic. Thank you. Size did the trick.

  4. Andrew said on October 26, 2013 at 7:06 am

    This solved my Outlook problem, too. Thank you. :)

  5. Charles said on December 7, 2013 at 7:23 pm

    Thank you so much, this started happening to me today and was causing big problems. You are a life saver, I hope I can help you in some way some day.

  6. garth said on November 7, 2014 at 7:13 pm

    You are a god – thank you!

  7. Faisal said on February 9, 2015 at 10:09 am

    thanks a lot…. work like charm.. :-)

  8. Simon said on March 24, 2015 at 11:36 pm

    Yah…thanks Claude. I’ve been having the same problem and tried all the suggestions…your solution was the answer. It had resized itself to a 0/0 box. Cheers

  9. Olu said on April 14, 2015 at 1:35 pm

    Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
    Thank you

  10. Coenig said on July 23, 2015 at 7:36 am

    Thanks a lot for the article. Don’t know why it happenend, don’t know how it got fixed, but it was really annoying and now it works :-)

  11. Fali said on January 20, 2016 at 4:19 pm

    Thanks a lot. I was facing this issue from past 3 week. I tried everything but no resolution. The issue was happening intermittently and mainly when I was changing the display of screen ( as i use 2 monitors). The only option i had was to do system restore. But thanks to you.

    1. MIki said on January 10, 2019 at 11:54 am

      I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!

  12. Christina said on January 20, 2016 at 6:14 pm

    Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007

  13. Oz said on July 22, 2016 at 3:20 pm

    Great tip! Thanks!

  14. Tracy said on September 1, 2016 at 4:48 pm

    Worked for me, too – thank you!!!

  15. shawn said on September 9, 2016 at 10:25 am

    It’s Worked for me, too
    thank you very much!

  16. Jari said on October 31, 2016 at 11:53 am

    I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!

  17. Michel H said on November 30, 2016 at 11:08 pm

    Thank you so much. Solved!
    Considering you published this in 2012, incredible not been debugged by Microsoft.
    Thank you again. M

  18. Ziad Bitar said on January 9, 2017 at 2:00 am

    This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.


  19. Anonymous said on February 15, 2017 at 5:24 pm

    Great tip. Thank you!!!! If it helps, I had to use the Control Key and the arrow keys at the same time to bring my window back into view. Worked like a charm.

  20. Rochelle said on March 6, 2017 at 11:59 am

    Thank you, this worked !!!!

  21. anom1234 said on May 20, 2018 at 11:20 pm

    Man, you are a fucking god. Thanks a lot, what an annoying bug!!

  22. JC said on October 12, 2020 at 2:14 pm

    Awesome, this post solved the issue. Many thanks!

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