Ordinarily,
sendmail will first look for a service-switch
file (ServiceSwitchFile) to see how it should look up its
aliases. If it finds one, and if the service term
aliases is listed in that file, it uses the
techniques listed following that term to look up its aliases. In the
absence of a service-switch, or if the service-switch could not be
opened, sendmail's fallback
position is to use the technique called files to
look up its aliases.
This AUTO_NIS_ALIASES definition, when specified during compilation,
also causes sendmail to automatically add the
technique nis if NIS was defined or
nis+ if NISPLUS was defined:
APPENDDEF(`confMAPDEF', `-DNIS -DAUTO_NIS_ALIASES')
APPENDDEF(`confMAPDEF', `-DNISPLUS -DAUTO_NIS_ALIASES')
The first line causes the fallback list of techniques to become
files then nis, and the
second causes it to become files then
nisplus. Note that AUTO_NIS_ALIASES is not
defined in any devtools/OS files distributed
with sendmail.
If you are running a precompiled sendmail
binary, you can use the -d0.10 debugging
command-line switch (-d0.10) to determine if
AUTO_NIS_ALIASES support is defined (if it appears in the list, it is
defined).
