-b x

Set operation mode to x. Operation modes are:

m

Deliver mail (default)

s

Speak SMTP on input side

a ^[a]

"Arpanet" mode (get envelope sender information from header)

d

Run as a daemon in background

D

Run as a daemon in foreground

t

Run in test mode

v

Just verify addresses, don't collect or deliver

i

Initialize the alias database

p

Print the mail queue

h

Print the persistent host status database

H

Purge expired entries from the persistent host status database

-B type

Indicate body type.

-C file

Use a different configuration file. Sendmail runs as the invoking user (rather than root) when this flag is specified.

-d level

Set debugging level.

-f addr

The envelope sender address is set to addr. This address may also be used in the From: header if that header is missing during initial submission. The envelope sender address is used as the recipient for delivery status notifications and may also appear in a Return-Path: header.

-F name

Sets the full name of this user to name.

-G

When accepting messages via the command line, indicate that they are for relay (gateway) submission. Sendmail may complain about syntactically invalid...