mailer= new Mail::Mailer [
Use the Unix mail program. command is the path to mail. The module searches for mailx, Mail, and mail, in that order.
Use the sendmail program. command is the path to sendmail.
Used for debugging. Calls /bin/echo to display the data, but doesn't actually send any mail. command is ignored, if specified.
If no arguments are specified, the Mailer object searches for executables in the above order and uses the first one found as the default mailer.