When sendmail processes the messages in its
queue, it sorts them by priority and handles those with the
lowest priority first.
The priority of a message is calculated once, using the
RecipientFactor (RecipientFactor) and
options, when the message is first created, and it is adjusted, using
this RetryFactor option, each time the message is
processed in the queue.
Each time a message from the queue fails to be delivered and needs to
be requeued, its priority is adjusted. That adjustment is made by
adding the value of this RetryFactor option.
The forms of the RetryFactor option are as follows:
O RetryFactor=inc configuration file (V8.7 and later)
-ORetryFactor=inc command line (V8.7 and later)
define(`confWORK_TIME_FACTOR',inc) mc configuration (V8.7 and later)
OZinc configuration file (deprecated)
-oZinc command line (deprecated)
The argument inc is of type
numeric. If inc is
missing, the default value is zero. If the entire
RetryFactor option is missing, the value for
inc defaults to 90000 (ninety thousand).
The default for the mc technique is to omit this
option. The increment is performed by adding the value of
inc to the previously stored message
priority each time that message is queued.
The RetryFactor option is not safe. If specified
from the command line, it can cause sendmail to
relinquish its special privileges.