K9 1.28 for Windows

by Robin Keir

Avg. Rating 4.2 (32 votes)

File Details

File Size 0.1 MB
License Freeware
Operating System Windows 2000/9x/Server 2003/XP
Date Added
Total Downloads 5,475
Publisher Robin Keir
Homepage K9

Publisher's Description

K9 is an email filtering application that works in conjunction with your regular POP3 email program and automatically classifies incoming emails as Spam or non-spam without the need for maintaining dozens of rules or constant updates to be downloaded. It learns over time and becomes better and better at being able to correctly identify spam. It learns to recognize what you consider to be spam.

Latest Reviews

junkcatcher

junkcatcher reviewed v1.28 on Apr 10, 2011

I have used this program for quite a few years it is by far the best spam filter around especially if the "use black hole" option is invoke.

However it badly needs updated and modernised to self-install on Thunderbird.
It will work with Thunderbird but setting it up is a bit fiddly.

pgrashof

pgrashof reviewed v1.28 on Oct 22, 2005

I've been using this software for at least a year or so, and never felt the need for alternatives. It's free, uses low resources, has no annoying popups, spyware or whatever.
You need to train K9, but then it works! And the side effect, the number of spam I receive on a daily basis has dropped substantially. It would be cool if it could also check hotmail and some other web based mail accounts, but, everything in there is spam anyway, need no filter for that :-)

httpd.confused

httpd.confused reviewed v1.28 on Feb 22, 2005

This is a nice Bayesian application, but Bayesian filters literally do more harm than good these days, in my experience.

beast64

beast64 reviewed v1.26 on Sep 25, 2004

Well, this is by far the best anti-spam program I ever used, and here's why:

* Nice, easy-to-use, and user-friendly GUI.
* It's a very small yet powerfull app.
* It consumes little memory.
* It's smart, it learns from its mistakes.
* It actually caches spam not pretend to do.
* It's easy to use and configure.
* It's FREE.

I've been using for about two weeks and it was sluggish at first but now its accuracy rose to aprox 99%, after I trained it a little it became quite smart and didn't make any mistake since then. So by all means, get this app NOW!!

klumy

klumy reviewed v1.26 on Feb 9, 2004

Excellent program !!

baarsel

baarsel reviewed v1.25 on Feb 1, 2004

Sorry, forgot the final figures: over a period of 19 days the accuracy is 94.8%. Over the last three days the accuracy is 100%, with over 80 messages processed!

BoNeLeSS

BoNeLeSS reviewed v1.18 on Dec 15, 2003

After a short training this little app is giving me *excellent* performance. With 99,5% precision in spam detection I can't find out a better anti-spam solution.

scodan

scodan reviewed v1.13 on Sep 1, 2003

Wow, only 3 legitimate email messages out of 784 total were incorrectly flagged as spam? What if one of those messages had to do with a job you were applying for? Or an important personal message? Are you going to lose it?

No, because you will manually sift through all the "spam" messages anyway. Which calls into question the whole point of running this sort of software. Does it just let you postpone the sifting? No, because an important, time-sensitive misfiled message needs immediate attention.

gerryf

gerryf reviewed v1.10 on Aug 7, 2003

784 emails in the last 3 weeks, 524 good, 261 spam, with only 3 good mistaken for spam, and 37 spam mistaken for good

That gives me 0.4% false positives, which is very safe, and 4.7% false negatives.

Overall, 94.9% effective which is darn solid. Best spam detector so far. Love it

kaweka

kaweka reviewed v1.09 on Jul 18, 2003

Impressive, very small and efficient.

Avg. Rating 4.2 (32 votes)
Your Rating
junkcatcher

junkcatcher reviewed v1.28 on Apr 10, 2011

I have used this program for quite a few years it is by far the best spam filter around especially if the "use black hole" option is invoke.

However it badly needs updated and modernised to self-install on Thunderbird.
It will work with Thunderbird but setting it up is a bit fiddly.

pgrashof

pgrashof reviewed v1.28 on Oct 22, 2005

I've been using this software for at least a year or so, and never felt the need for alternatives. It's free, uses low resources, has no annoying popups, spyware or whatever.
You need to train K9, but then it works! And the side effect, the number of spam I receive on a daily basis has dropped substantially. It would be cool if it could also check hotmail and some other web based mail accounts, but, everything in there is spam anyway, need no filter for that :-)

httpd.confused

httpd.confused reviewed v1.28 on Feb 22, 2005

This is a nice Bayesian application, but Bayesian filters literally do more harm than good these days, in my experience.

beast64

beast64 reviewed v1.26 on Sep 25, 2004

Well, this is by far the best anti-spam program I ever used, and here's why:

* Nice, easy-to-use, and user-friendly GUI.
* It's a very small yet powerfull app.
* It consumes little memory.
* It's smart, it learns from its mistakes.
* It actually caches spam not pretend to do.
* It's easy to use and configure.
* It's FREE.

I've been using for about two weeks and it was sluggish at first but now its accuracy rose to aprox 99%, after I trained it a little it became quite smart and didn't make any mistake since then. So by all means, get this app NOW!!

klumy

klumy reviewed v1.26 on Feb 9, 2004

Excellent program !!

baarsel

baarsel reviewed v1.25 on Feb 1, 2004

Sorry, forgot the final figures: over a period of 19 days the accuracy is 94.8%. Over the last three days the accuracy is 100%, with over 80 messages processed!

BoNeLeSS

BoNeLeSS reviewed v1.18 on Dec 15, 2003

After a short training this little app is giving me *excellent* performance. With 99,5% precision in spam detection I can't find out a better anti-spam solution.

scodan

scodan reviewed v1.13 on Sep 1, 2003

Wow, only 3 legitimate email messages out of 784 total were incorrectly flagged as spam? What if one of those messages had to do with a job you were applying for? Or an important personal message? Are you going to lose it?

No, because you will manually sift through all the "spam" messages anyway. Which calls into question the whole point of running this sort of software. Does it just let you postpone the sifting? No, because an important, time-sensitive misfiled message needs immediate attention.

gerryf

gerryf reviewed v1.10 on Aug 7, 2003

784 emails in the last 3 weeks, 524 good, 261 spam, with only 3 good mistaken for spam, and 37 spam mistaken for good

That gives me 0.4% false positives, which is very safe, and 4.7% false negatives.

Overall, 94.9% effective which is darn solid. Best spam detector so far. Love it

kaweka

kaweka reviewed v1.09 on Jul 18, 2003

Impressive, very small and efficient.

klumy

klumy reviewed v1.08 on Jul 5, 2003

Very nice ;)

Xhargh

Xhargh reviewed v1.08 on Jul 5, 2003

asaens: Check this out: http://keir.net/k9_history.html
The author does write on his page what the changes are.
Statistics so far (I've used the program for 76 days)
1727 mails in total
280 good emails
1447 spam emails
Overall accuracy: 99.7%

asaenz

asaenz reviewed v1.08 on Jul 5, 2003

My 3rd/4th week trying this program and it 'seems' to be getting better at catching blacklisted spam. I just wish the author would indicate the changes from one version to the next either here or on his site (the site lists the versions but I can't find changes, additions, removals, etc..) Would be an improvement if you could add some sites like DNS blacklist servers -- maybe a future version. Also, needs to watch for identical records to avoid filling the database with duplicate records -- maybe an indexing scheme.

RAT

RAT reviewed v1.0 on Apr 22, 2003

Impressive!!!!

Bokijana

Bokijana reviewed vRelease Candidate 3 on Apr 18, 2003

Very Good

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