[dns-operations] Reporting glue as authoritive data -- Bug!
paul at vix.com
Sat Jan 26 02:23:57 UTC 2008
> > Sendmail used QTYPE=3DANY 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 used ANY to work around a BIND  bug with
> misconfigured zones.
no, really, it didn't. sendmail used ANY because if there was an MX in the
cache it would come, and if there was an A in the cache it would come, and
if both were in the cache both would come. this was an opportunistic attempt
to save on round trips. i have this directly from the original author of the
MX logic in sendmail.
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