System administration command. sendmail is a mail transfer agent (MTA) or, more simply, a mail router. It accepts mail from a user’s mail program, interprets the mail address, rewrites the address into the proper form for the delivery program, and routes the mail to the correct delivery program.
Use local submission configuration file /etc/mail/submit.cf, even when no mail is sent from the command line.
Use configuration file /etc/mail/sendmail.cf, even when mail is sent from the command line.
Set message body type. Accepted values are 7BIT and 8BITMIME.
Set operation mode to x. Operation modes are:
Run in ARPAnet mode.
Run as a daemon.
Run as a daemon, but remain in the foreground.
Print persistent host status information.
Purge expired entries from persistent host status information.
Initialize the alias database.
Deliver mail (the default).
Print the mail queue.
Speak SMTP on input side.
Run in test mode.
Verify addresses; do not collect or deliver.
Use configuration file file.
Set debugging level.
Set full name of user to name.
Sender’s name is name.
Relay message submission. Used by rmail.
Do not interpret dots on a line by themselves as a message terminator.
Set hop count (number of times message has been processed by sendmail) to cnt.
Use the specified log identifier for messages sent to syslogd.