[dns-operations] Reporting glue as authoritive data -- Bug!

[Paul Vixie]

> > QTYPE=ANY is so poorly specified and so widely misimplemented that
> > you can't use it in normal operations, it is, at best, a diagnostic
> > tool (a weak one).
> 
> Sendmail used QTYPE=ANY to retrieve A and AAAA records in one query.
> I guess quite a few mail servers still do this, so it should better
> work, at least to some degree.

sendmail falls back to QTYPE=MX when it doesn't work, which is mostly.

> But then, Sendmail seems to fail to properly sort MX records by
> priority in some cases.  Oh well.

yes.