An expensive mailer is a delivery agent that
contains an e flag in its
F= equate (F=e). Typically, such delivery agents are
associated with slow network connections such as SL/IP, or with
costly networks such as those with high per-connect or connection
startup rates. Whatever the reason, the
HoldExpensive option allows you to queue all such
mail for later delivery rather than connecting on demand. (Queuing is
described in Chapter 11.)
Note that this option affects only the initial delivery attempt, not later attempts when the queue is processed. Essentially, all this option does is to defer delivery until the next time the queue is processed.
The forms of the
HoldExpensive option are as
O HoldExpensive=bool ← configuration file (V8.7 and later) -OHoldExpensive=bool ← command line (V8.7 and later) define(`confCON_EXPENSIVE',bool) ← mc configuration (V8.7 and later) -c ← command-line shorthand (not recommended) Ocbool ← configuration file (deprecated) -ocbool← command line (deprecated)
bool is of type
Boolean. If the bool
argument is missing, the default is true (expensive mail is queued).
If the entire
HoldExpensive option is missing, the
default value is false (expensive mail is delivered immediately).
-v (verbose) command-line switch automatically
HoldExpensive option to false. The
HoldExpensive option is not safe. If specified
from the command line, it can cause sendmail to
relinquish its special privileges.