The sendmail.cf File

This file contains a few definitions and otherwise merely points to the tables where the real work gets done. In general, it is only necessary to specify:

• the pathnames and filenames used on the local system.
• the name(s) the site is known by for e-mail purposes.
• which default mailer (and perhaps smart relay host) is desired.

There are a large variety of parameters that can be defined to establish the behavior of the local site or to override compiled-in configuration items. These configuration options are identified in the file ida/cf/OPTIONS in the source directory.

A sendmail.m4 file for a minimal configuration (UUCP or SMTP with all non-local mail being relayed to a directly connected smart-host) can be as short as 10 or 15 lines excluding comments.

• An Example sendmail.m4 File
• Typically Used sendmail.m4 Parameters
  • Items that Define Paths
  • Defining the Local Mailer
  • Dealing with Bounced Mail
  • Domain Name Service Related Items
  • Defining Names the Local System is Known by
  • UUCP-Related Items
  • Relay Systems and Mailers
  • The Various Configuration Tables
  • The Master Sendmail.mc File
  • So Which Entries are Really Required?