mail01
	Test that mail user@domain will send a mail to that user at that domain.

mail02
	Test that mail user@bad-domain will result in a warning from the mailer daemon that the domain does not exist.

mail03
	Test that mail non_existent_user@localhost will result in delivery failure.  Mailer-Daemon will report this failure.

mail04
	Test that mail -c user@domain option will carbon copy that user.

mail05
	Test that mail -b user@domain option will blind carbon copy that user.