What is host.exe?

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 host.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.

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Host.exe file information

Windows Task Manager with host
Host.exe process in Windows Task Manager

The process known as Personal SMTP server or 1March appears to belong to software Rts Ticketing or SPECTral Personal SMTP Server by Microsoft ( or JRRT Project, RIVS Technologies.

Description: Host.exe is not essential for Windows and will often cause problems. Host.exe is located in a subfolder of C:\Windows. Known file sizes on Windows 8/7/XP are 791,040 bytes (22% of all occurrences), 790,528 bytes and 5 more variants. 
Host.exe is a file with no information about its developer. The program has no visible window. Host.exe is located in the Windows folder, but it is not a Windows core file. It is not a Windows system file. The application listens for or sends data on open ports to a LAN or the Internet. Host.exe is able to connect to the Internet, record keyboard and mouse inputs, monitor applications and hide itself. Therefore the technical security rating is 81% dangerous, however you should also read the user reviews.

Recommended: Identify host.exe related errors

Important: Some malware also uses the file name host.exe, for example TROJ_DROPPER.CBV (detected by TrendMicro), and Trojan-Spy.Win32.Delf.cmo (detected by F-Secure). Therefore, you should check the host.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

right setings
Added by the W32/Kelvir-S. An MSN Messenger worm, it will attempt to disable security related processes and services.

Summary: Average user rating of host.exe: based on 4 votes with 2 user comments. One user thinks host.exe is essential for Windows or an installed application. One user thinks it's neither essential nor dangerous. 2 users think host.exe is dangerous and recommend removing it.

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Best practices for resolving host issues

A clean and tidy computer is the key requirement for avoiding problems with host. 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 doing a repair of your installation, or in the case of Windows 8, 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 host.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

host.exe [all]