This program is a front end program for nullmailer-inject and
nullmailer-smtpd. It is used by programs that expect a sendmail
interface for sending email. After parsing the command-line arguments, this
program executes either nullmailer-inject or nullmailer-smtpd
depending on the presence of the -bs option on the command-line. See
the documentation for nullmailer-inject for details on how messages are
reformatted and queued.