What is K9.exe?

The genuine K9.exe file is a software component of unknown by KeirNet.
K9.exe is an executable file that runs the K9 application, a spam filter designed to integrate with POP3 email programs and automatically classifies unsolicited and blacklisted email as spam. This is not a critical Windows component and should be removed if known to cause problems. K9 uses several algorithms of statistical analysis of incoming email. These provide for high accuracy when the program is figuring out whether something is spam or not. K9 is also a self-learning program that constantly adjusts its algorithms if it has made a mistake or is the user has suggested any changes. K9 is available only for POP3 emails and does not work with webmail. K9 is developed and maintained by Robin Keir, a British software engineer who has been programming since the age of 13. Born and raised in Cardiff, his programming career has spanned through micro-computer sales, management software, industrial electronic automation control, computer games development, multimedia device application development, and most recently, information security. Robin is currently based in Los Angeles, California, USA.

K9 stands for K9 Spam filter

The .exe extension on a filename indicates an executable file. Executable files may, in some cases, harm your computer. Therefore, please read below to decide for yourself whether the K9.exe on your computer is a Trojan that you should remove, or whether it is a file belonging to the Windows operating system or to a trusted application.

Click to Run a Free Scan for K9.exe related errors

K9.exe file information

Windows Task Manager with K9
K9.exe process in Windows Task Manager

The process known as K9 belongs to software K9 by KeirNet (

Description: K9.exe is not essential for the Windows OS and causes relatively few problems. The file K9.exe is located in a subfolder of "C:\Program Files". The file size on Windows 10/8/7/XP is 82,944 bytes. 
The program has a visible window. There is no information about the author of the file. The K9.exe file is not a Windows system file. The program uses ports to connect to or from a LAN or the Internet. The application starts when Windows starts (see Registry key: User Shell Folders). Therefore the technical security rating is 34% dangerous, however you should also read the user reviews.

Uninstalling this variant: The software vendor offers the option to uninstall K9 software via Windows Control Panel/Add or Remove Programs (Windows XP) or Programs and Features (Windows 10/8/7).

Recommended: Identify K9.exe related errors

Important: Some malware camouflages itself as K9.exe, particularly when located in the C:\Windows or C:\Windows\System32 folder. Therefore, you should check the K9.exe process on your PC to see if it is a threat. We recommend Security Task Manager for verifying your computer's security. This was one of the Top Download Picks of The Washington Post and PC World.


User Comments

Ist der K9 Spamfilter.
  Murphy   (further information)
K9 spam filter application
  Robin Keir   (further information)
K9 is a Spamfilter. NO spyware
  Jeroen Vandezande   (further information)

Summary: Average user rating of K9.exe: based on 3 votes with 3 user comments. 3 users think K9.exe is essential for Windows or an installed application.

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Best practices for resolving K9 issues

A clean and tidy computer is the key requirement for avoiding problems with K9. This means running a scan for malware, cleaning your hard drive using cleanmgr and sfc /scannow, uninstalling programs that you no longer need, checking for Autostart programs (using msconfig) and enabling Windows' Automatic Update. Always remember to perform periodic backups, or at least to set restore points.

Should you experience an actual problem, try to recall the last thing you did, or the last thing you installed before the problem appeared for the first time. Use the resmon command to identify the processes that are causing your problem. Even for serious problems, rather than reinstalling Windows, you are better off repairing of your installation or, for Windows 8 and later versions, executing the DISM.exe /Online /Cleanup-image /Restorehealth command. This allows you to repair the operating system without losing data.

To help you analyze the K9.exe process on your computer, the following programs have proven to be helpful: Security Task Manager displays all running Windows tasks, including embedded hidden processes, such as keyboard and browser monitoring or Autostart entries. A unique security risk rating indicates the likelihood of the process being potential spyware, malware or a Trojan. Malwarebytes Anti-Malware detects and removes sleeping spyware, adware, Trojans, keyloggers, malware and trackers from your hard drive.

Other processes

K9.exe [all]