-o
The database map is optional V8.1 and later
Ordinarily, in the case of types that employ disk
files, sendmail will complain
if a specified file cannot be opened for reading. If
the presence of a database file is optional (as it
can be on certain machines), the -o switch should be used
to tell sendmail that the
database is optional. Note that if a database is
optional and cannot be opened, all lookups will
silently fail for rules that use that
database.
Also note that for network-based types of database
maps, this -o
switch can be used to cause failed initializations
to be ignored. If a database map is used during the
processing of a message, and if a lookup fails in
the absence of a -o switch, the message (or SMTP
request) will be rejected with a temporary
failure.
Get sendmail, 4th Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
