[Unbound-users] A Record Synthesis From Address-like Domain Names (dnscache behaviour)

[Tony Finch]

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.
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