File Extension Library

.CF File Extension

  • Category: Settings Files
  • Format: Text

What are .CF files and how to open them?

Can't open .CF file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .CF file.

What is a .CF file extension?

.CF file extension has been classified as Settings Files. The format of .CF file is Text

.CF is Sendmail Configuration File

Preference file used to configure the Unix sendmail program; defines the SMTP server, mail relay hosts, and hundreds of other settings; saved in a text format and is compiled by the Unix M4 macro processor each time sendmail is run.

The sendmail configuration file is named "" and is stored in the following location: /etc/mail/

NOTE: CF files should not be confused with ColdFusion Markup files, which have a .CFM extension.

List of all softwares that can open the Sendmail Configuration File

How to fix problems with .CF files

  1. You need to update the application that you normally use to open .CF files. Only the latest version of the software supports the current .CF file format
  2. You need to check the .CF file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)