#!/bin/bash
set -u

send_email() {
  local address="$1"
  local subject="$2"
  local text="$3"

  echo "Sending mail with text:"
  echo "  ${text}"
  echo "and subject:"
  echo "  ${subject}"
  echo "to recipient:"
  echo "  ${address}"
  return 0
}
{
  send_email "foo.bar@baz.org" "Test subject" "Hello World!"
  exit "$?"
}