User Reviews

K9

K9 is an anti-spam 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. The progra ...

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Average of 18 user ratings:

Dec 23, 2007
For version:
1.28

The best (free!!!) spam filter ever! - try it

Interface: 3
Features: 4
Ease of use: 5
Value: 5
Overall:

I am a Thunderbird mail client user and some day I was tiered of all those spam mails still coming in through Thunderbird's built in filter. So I searched the Web for some spam filtering software and I found out that the freeware (!!!) K9 could be the ultimate solution... The first three days K9 had to learn a lot, but I have to say that it's an excellent student. K9 has also a filter feature and I use this only for 'Casino' related spam mail. Now these mails too stay 100% out off my Inbox! Today I use K9 100 days and the other 97 days of use I had to correct just about 10 other mails, of which K9 thought it was spam, while it was not... If you are also tiered of all those daily spam and you are looking for a good peace of software, please listen: Give it a try and after some days you will see the results and you'll be another happy K9-user, I am sure! Also (or even) when you are a Thunderbird user. Luc

Review by: Luco53 (2)
Read all 2 reviews by Luco53

Sep 01, 2006
For version:
1.28

Bad product

Interface: 1
Features: 1
Ease of use: 1
Value: 1
Overall:

Started very nice for 3 days, but, after that hung the system, and It use a lot of CPU, even with the check to put in lower priority.

Review by: lmassoni
First post

Apr 27, 2006
For version:
1.28

Good but abandoned by developer

Interface: 3
Features: 4
Ease of use: 3
Value: 4
Overall:

K9 is one of the best anti-spam tools around. Unfortunately, there are some bugs (RETR command instead of TOP, possibility to cheating program using bad mail boundaries...). K9 isn't updated about two years and this is the reason why I give only four stars for it. If the author change his mind and update K9 it can be really one of top anti-spam tools.

Review by: Holmes (10)
Read all 10 reviews by Holmes

Feb 10, 2006
For version:
1.28

Say good night, mcaffee

Interface: 4
Features: 4
Ease of use: 4
Value: 5
Overall:

After struggling with McAffee far too long and getting far too poor results, I gave K9 a spin. After the first week I was getting 95% accuracy, which soon surpassed 98%. With 3 business and 3 personal mailboxes, my typical day's mail consists of 20-25 valid messages and 60-75 spam. K9's interface makes it exceptionally easy to scrap the garbage while picking out the rare few mislabeled as spam. One suggestion - add a one-click means to permanently delete the junk folder. This is one great program!

Review by: BeesKneesSat
First post

Jan 12, 2006
For version:
1.28

Good with outlook express message rules

Interface: 3
Features: 4
Ease of use: 5
Value: 5
Overall:

Does quite a good job of filtering all but the most persistent spammers with OE. Seems to attract an inordinate number of penny stock ads which it conveniently disposes of. Mr. David Oltmann

Review by: davyjones (8)
Read all 8 reviews by davyjones

Jan 09, 2006
For version:
1.28

The best one for me

Interface: 5
Features: 3
Ease of use: 4
Value: 5
Overall:

I tried several freeware spam solutions and K9 wins over POPfile for its simplicity. A mail is SPAM or no spam, that's all. I have put my mail-rules so that mails that match both the DNSBL (DNS blacklist) and SPAM flag are deleted, I have a 100% result there. Mails that only score SPAM are put in a separate SPAM folder and these score above 98%. A minus point is that when the databases get too big you can't trim them anymore, but when you trim your database once a week (or even once a month) K9 should run without problems. Another minus is the (apparent) fact that the software isn't updated anymore, but who needs upgrading when it does its job?

Review by: Atagong (5)
Read all 5 reviews by Atagong

Aug 26, 2005
For version:
1.28

Excellent !

Interface: 4
Features: 4
Ease of use: 5
Value: 5
Overall:

Does the job very well, it is stable, takes just a very little of memory, easy to use . . .

Review by: Dolf01 (14)
Read all 14 reviews by Dolf01

Jun 23, 2005
For version:
1.28

Spam filter is totally not functioning

Interface: 2
Features: 3
Ease of use: 2
Value: 1
Overall:

Spam filter is totally not functioning - Recent Emails tab is not showing any bypassing emails. It's buggy anyway. I don't see why my reinstalling twice still got the same symptom, and don't see why people rating it so high. I'm just telling the truth. If it works, I'll revise this comment at once, but I've just uninstalled it.

Review by: rioooo (5)
Read all 5 reviews by rioooo

May 26, 2005
For version:
1.28

99.8% accurate !!!!!!!!

Interface: 5
Features: 5
Ease of use: 5
Value: 5
Overall:

This a very good well written program effective clean lean n mean. If you have MS Outlook or OutLook Express you must use this or SpamPal to prevent junk choking you in box. Setting up for use with Outlook/Outlook Express is just a couple of clicks and setting up rules in the mail client to delete mail tagged as junk after that you need to train it for a couple of days, in my case it was 99.8% accurate. However I switched to using Mozilla Thunderbird as an email client as it has a built in spam filter which is pretty good I no longer need an external filter such K9 or SpamPal.

Review by: Btrident (15)
Read all 15 reviews by Btrident

Mar 20, 2005
For version:
1.28

Excellent. does what it says.

Interface: 5
Features: 4
Ease of use: 5
Value: 5
Overall:

Being relegated back to my old P166 I've had the painstaking process of updating security features. Although not as customizable as Spamhilator this program works very well and is roughly a tenth of the size. Also having only 32MB RAM I needed a program that wasn't a memory hog. This is definitely it. Additionally it configured itself perfectly with Outlook Express 6.0; so, setup was a breeze.

Review by: SmileyGuy (12)
Read all 12 reviews by SmileyGuy

Dec 11, 2004
For version:
1.28

Best

Interface: 3
Features: 5
Ease of use: 3
Value: 5
Overall:

It does it's job.

Review by: Johnny002
First post

Dec 05, 2004
For version:
1.28

K9 spam filter

Interface: 3
Features: 5
Ease of use: 3
Value: 5
Overall:

I have used this program for about 6 months. The configuration is a bit geeky, but after it's setup it works without much user intervention. It has blocked over 99 percent of my spam since then and works very well with outlook. I would reccomend the program to all outlook users.

Review by: Feedguy
First post

Oct 23, 2004
For version:
1.28

Perfect antispam tool

Interface: 5
Features: 5
Ease of use: 5
Value: 5
Overall:

I've used K9 for more than a year without problems. Very easy and 100% secure protection. I recommend it to everyone. Many thanks to the guys from keir.net!

Review by: domainfaith
First post

Oct 05, 2004
For version:
1.28

100% for months

Interface: 5
Features: 5
Ease of use: 5
Value: 5
Overall:

This is not only the best but also the most advanced program I have ever seen. Using the Whitelist, the Blacklist with around 80 regular expressions plus Bayesian filter, it produces 100% success. Keep in mind: 100% means not even one false positivie. One word to Justin4811 below: 1. Download the documentation if you need help and 2. Buy a typewriter because the computer manual will not tell you where the paper is coming out when printing. Sam

Review by: AThorn (2)
Read all 2 reviews by AThorn

Jun 25, 2004
For version:
1.28

Excellent

Interface: 5
Features: 4
Ease of use: 5
Value: 5
Overall:

Been using for a month with 96% accuracy. Easy to implement. Automatically changes your Outlook Express Incoming and Outgoing addresses option so you don't have to fool with it. Uses your actual emails as a database build so it takes about 2 weeks to get a good database. If you accidentally delete your "Spam" folder you must reestablish your "message rules" under Tools. Has an excellent manual you can download directly from Keir's site. Running WIN XP. Recommend for anyone who doesn't want to pay for a spam filter program. Its FREE!

Review by: CajunD
First post

Jun 07, 2004
For version:
1.28

Very slick setup that is easy to use

Interface: 5
Features: 5
Ease of use: 4
Value: 5
Overall:

This program has a very nice interface and the setup of it went without an issue. The authors web site has very details setup instructions on it, but you dont have to follow all of the advanced items for the program to work. The stats page is very nice to see how much mail has been received, how much is spam and tons of other info. I would highly recommend this program if you are using OE and need a higher level of spam filtering that what is provided by OE.

Review by: mprindle
First post

May 26, 2004
For version:
1.28

Outstanding addition to your email program

Interface: 5
Features: 5
Ease of use: 5
Value: 5
Overall:

This program is simply outstanding and should have been made a part of Outlook Express by Microsoft. It is very easy to install and configure provided the user is moderately sophisticated about computing. K9 has a slick interface which is virtually transparent, much more so than most programs of its ilk. Once properly set up K9 will learn to filter out most if not all of your spam. Once you have it properly installed, K9 is easy to use even for the digitally challenged. All you need to do is read and consider the excellent set up instructions at the developer's web site. The 30 minutes or so you might have to invest initially in understanding how the program works will ultimately make your life virtually spam free.

Review by: mongatu
First post

Feb 12, 2004
For version:
NA

Love this program!

Interface: 0
Features: 0
Ease of use: 0
Value: 0
Overall:

This program does exactly what I want it to do. I had no difficulties setting it up and do not understand any of the bad comments. To the people at KeirNet - keep up the great work!

Review by: Kattolio (3)
Read all 3 reviews by Kattolio