service.switch.1m (2010 09)

s
service.switch(1M) service.switch(1M)
NAME
service.switch - indicate lookup sources and fallback mechanism
SYNOPSIS
/etc/mail/service.switch
DESCRIPTION
/etc/mail/service.switch
is a sendmail (1M) service switch similar to
/etc/nsswitch.conf
(see nsswitch.conf(4)) that indicates the lookup source for hostnames and aliases. It consists of two lines,
one for
hosts and one for aliases. The lookup sources are listed after the
hosts or aliases name.
For
hosts, one or more of the following can be listed:
files (for /etc/hosts)
dns (for Domain Name Service)
nis (for NIS)
For
aliases, one or more of the following can be listed:
files (for /etc/mail/aliases
)
nis (for NIS)
Sample Configurations
1. The default configuration for
service.switch
is to use dns for hostname lookups and the
aliases file for aliases. (Note that due to a bug, the hostname lookup will never fallback to a file
lookup, so anything listed after dns will be ignored.)
hosts dns files
aliases files
2. To work with a non-DNS environment that uses file lookups (/etc/hosts), the following
service.switch can be used:
hosts files
aliases files
3. To work with a NIS environment that does not use DNS, the following service.switch
can be
used:
hosts nis files
aliases nis files
Modifying sendmail.cf
The sendmail.cf file must be modified to request the usage of the service.switch
file. Otherwise,
the default for
sendmail.cf is to use DNS for hostname lookups, and files for alias lookups. To use
NIS or files, the following line must be uncommented in sendmail.cf:
#O ServiceSwitchFile=/etc/mail/service.switch
SEE ALSO
sendmail(1M).
HISTORY
The
service.switch file appeared in sendmail V8.
HP-UX 11i Version 3: September 2010 − 1 − Hewlett-Packard Company 1