Use the following values for this setting:
0: Enables 1: Disables
This vartiable is new in 6.5.4
SPR# SIWA5VUA8H - After rebuilding ($Users) view index in the NAB, some canonical name entries could not be found.
This can cause mail routing and other serious problems.
A workaround is to set DISABLE_VIEW_REBUILD_OPT=1 in the Notes.ini.
This will rebuild the view correctly.