#!/usr/bin/perl
# mxhost - find mx exchangers for a host
use Net::DNS;

$host = shift;
$res = Net::DNS::Resolver->new();
@mx = mx($res, $host) or die "Can't find MX records for $host (".$res->errorstring.")\n";

foreach $record (@mx) {
    print $record->preference, " ", $record->exchange, "\n";
}