/etc/default/sendmail

This file is used to store start-up options for sendmail so that they are not removed when a host is upgraded. The following variables can be used:

MODE=-bd

Selects the mode to start sendmail with. Use the -bd option or leave it undefined.

QUEUEINTERVAL=#

Sets interval for the mail queues to be run. # can be a positive integer followed by either s for seconds, m for minutes, h for hours, d for days, or w for weeks. The syntax is checked before sendmail is started. If the interval is negative or if the entry does not end with an appropriate letter, the interval is ignored and sendmail starts with a queue interval of 15 minutes.

OPTIONS=string

Selects additional options to be used with the sendmail command. No syntax checking is done, so be careful when making changes to this variable.