If this -O switchis specified, sendmail never tries a zero byte, which can speed matches.
Note that if both -N and -O are specified, sendmail will not produce an error message, and
will never try to match at all, thus causing all lookups to appear to fail.
23.3.10 -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 switchsh ould 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 switchcan 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.
23.3.11 -q
Don??™t strip quotes from key V8.7 and later
Ordinarily, sendmail strips all the nonescaped quotation marks (those not prefixed with a
backslash) from a key before looking it up. For example, the following key:
"Bob "bigboy" Roberts \(esq\)"@bob.com
will have its nonescaped quotation marks removed and end up looking like this:
Bob "bigboy" Roberts (esq)@bob.
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