-D
Don’t use if DeliveryMode=defer V8.10 and later
The defer
setting
of the DeliveryMode
option (DeliveryMode on page 1004) is intended
for sites that do not have a continuous connection
to the Internet (specifically, dial-on-demand
sites). For such sites, mail should be placed in the
queue without interacting with the Internet (which
is likely unavailable). Then, when the Internet
connection is made, a normal queue run will deliver
the mail.
Some database maps (such as those that look up hosts
and possibly those that log messages with
syslog) should probably not
be used when sendmail is
running in defer
mode. This -D
database switch can also be used with a few
database-map types. When it is, it advises those
types to not operate when
sendmail is in defer
mode.
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