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service.switch(1M)					    service.switch(1M)

NAME
       service.switch - indicate lookup sources and fallback mechanism

SYNOPSIS
DESCRIPTION
       is a sendmail(1M) service switch similar to (see nsswitch.conf(4)) that
       indicates the lookup source for hostnames and aliases.  It consists  of
       two  lines, one for and one for The lookup sources are listed after the
       or name.

       For one or more of the following can be listed:

       For one or more of the following can be listed:

   Sample Configurations
       1. The default configuration for is to use for hostname lookups and the
	  file for aliases.  (Note that due to a bug, the hostname lookup will
	  never fallback to a file lookup, so anything listed  after  will  be
	  ignored.)

       2. To  work  with a non-DNS environment that uses file lookups the fol‐
	  lowing can be used:

       3. To work with a NIS environment that does not use DNS, the  following
	  can be used:

   Modifying sendmail.cf
       The file must be modified to request the usage of the file.  Otherwise,
       the default for is to use DNS  for  hostname  lookups,  and  for	 alias
       lookups.	 To use NIS or the following line must be uncommented in

SEE ALSO
       sendmail(1M).

HISTORY
       The file appeared in sendmail V8.

							    service.switch(1M)

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