[Exim] Bogus MX records

There are quite a few domains out there that have their MX record set to
a name that resolves to 127.0.0.1

The problem is that it causes mail to be relayed for those domains when
relay_domains_include_local_mx = true

Is there some way to tell exim not to consider 127.0.0.1 as a valid MX?

Please cc me directly on reply as I generally read the posts from an
archive rather than subscribing directly.

Thanks

George Bonser