.CF File Extension
Sendmail Configuration File
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What is a CF 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.
More Information
The sendmail configuration file is named "sendmail.cf" and is stored in the following location: /etc/mail/sendmail.cf
NOTE: CF files should not be confused with ColdFusion Markup files, which have a .CFM extension.