A switched map is one that, either as the result of a service-switch
file or because of sendmail's
internal logic, causes lookups to follow a select path. For example,
Sun's Solaris 2 nsswitch.conf
might specify that aliases be looked up in the order
files, then nis:
switch_map_open(name, file, mode) 
from -d38.2
switch_map_find => nummaps
dbtype
...
First the number of database maps found is printed with
nummaps, then the database type for each map
found in the list is printed, such as files, or
nis.
