Jan-Piet Mens <jpmens.dns at gmail.com> wrote: > > for the benefit of MTAs delivering mail to MX records > > containing IP addresses instead of hostnames. > > An MX record MAY not contain an IP address. In fact it MUST NOT :-) My mail servers (40K users) treat domains that are misconfigured this way as invalid and it does not cause noticeable interoperability problems. Tony. -- f.anthony.n.finch <dot at dotat.at> http://dotat.at/ Viking, North Utsire, South Utsire: Northwesterly 7 to severe gale 9, decreasing 5 or 6 later. Very rough or high. Squally showers. Good, occasionally poor.