O OptionName=argument          # for the configuration file
-O OptionName=argument         # for the command line
define(`m4Name',argument)     # for m4 configuration

ConnectionRateWindowSize

m4 name: confCONNECTION_RATE_WINDOW_SIZE

Argument: number

Default value: 60

Sets the number of seconds for incoming connections to be maintained. 

FallBackSmartHost

m4 name: confFALLBACK_SMARTHOST

Argument: hostname

To ensure that mail gets delivered to the clients, this option provides a well-connected host that serves as a backup (or failover) for MX records that fail. 

InputMailFilters

m4 name: confINPUT_MAIL_FILTERS

Argument: filename

Lists the input mail filters for the sendmail daemon.

PidFile

m4 name: confPID_FILE

Argument: filename

Default value: /var/run/sendmail.pid

As in previous releases, the file name is macro-expanded before it is opened. Additionally, in version 8.13, the file is unlinked when sendmail exits.

QueueSortOrder

m4 name: confQUEUE_SORT_ORDER

Added argument: none

In version 8.13 none is used to specify no sorting order.

RejectLogInterval

m4 name: confREJECT_LOG_INTERVAL

Argument: period-of-time

Default value: 3h, which represents three hours.

When a daemon connection is refused for the period-of-time specified, the information is logged.

SuperSafe

m4 name: confSAFE_QUEUE

Short name: s

Added argument: postmilter

Default value: true

If postmilter is set, sendmail defers synchronizing the queue file until all milters have signaled acceptance of the message. For this argument to be useful, sendmail must be running as an SMTP server. Otherwise, postmilter operates as if you are using the true argument.