3 The K Command Switches | 891
(?§24.9.35 on page 1004) is set to defer. Also note that this -T database switchaffects only
the return value. It does not affect the outcome of mail delivery. To affect the outcome on
temporary failures, use the -t switch (?§23.3.14 on page 891).
23.3.14 -t
Ignore temporary errors V8.10 and later
Usually it is acceptable for a lookup to fail because of a temporary failure of a system
resource. When reading from a network database map (such as the DNS name server)
temporary failures (suchas server down) generally cause email to be requeued for a later
try. However, you might sometimes find it desirable for a database map??™s temporary failures
to be ignored. In suchcases, you can enable this -t database switch. With it set, a
temporary error will cause the mail to be delivered.
Note that failure of a key to be found in a database map is not a temporary error. Also note
that this switch just determines the outcome of a message. It does not affect the nature of
the returned value. To affect the return value on temporary failures, use the -T database
switch (?§23.3.13 on page 890).
23.3.15 -v
Specify the value??™s column V8.7 and later
The manner in which the key and its value are visually displayed in flat, sequential text files
and certain network services, might not be directly suitable for use with database maps.
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