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This is the Title of the Book, eMatter Edition
Copyright ?© 2007 O??™Reilly & Associates, Inc. All rights reserved.
16 | Chapter 1: Some Basics
The sendmail program doesn??™t run mail delivery programs directly. Instead, it runs a
shell and tells that shell to run the program. The name of the shell is listed in the
configuration file in a line* that begins with Mprog:
Mprog, P=/bin/sh, F=lsDFMoqeu9, S=EnvFromL/HdrFromL, R=EnvToL/HdrToL, D=$z:/,
In this example, the shell is the /bin/sh(1). Other programs can appear in this line,
suchas /bin/ksh(1), the Korn Shell, or smrsh(1), the sendmail restricted shell that is
supplied with the source distribution.
1.6.7 Role in Network Transport
Another role of sendmail is that of transporting mail to other machines. A message is
transported when sendmail determines that the recipient is not local. The following
lines from a typical configuration file define delivery agents for transporting mail to
other machines:
Msmtp, P=[IPC], F=mDFMuX, S=EnvFromSMTP/HdrFromSMTP, R=EnvToSMTP/HdrFromSMTP,
Muucp, P=/usr/bin/uux, F=DFMhuUd, S=FromU, R=EnvToU/HdrToU, M=100000,
The actual lines in your file might differ. The name smtp in the preceding example
might appear in your file as ether or ddn or something else. The name uucp might
appear as suucp or uucp-dom. There might be more such lines than we??™ve shown here.
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