fdnsmxlist - resolve a list of MX records for hostname
fdnsmxlist will attempt to look up a list of MX records for hostname.
If any are found, they are printed to standard output seperated by
newlines in the format:
Protocol (Priority) hostname:port
and the program exits with return code 0. If not, nothing is printed
and the program exits with return code 1.
Ian Gulliver <email@example.com>