In article <20150309110803.4516.qm...@cr.yp.to> you write:
>My "qmail" software is very widely deployed (on roughly 1 million SMTP
>server IP addresses) and, by default, relies upon ANY queries in a way
>that is guaranteed to work by the mandatory DNS standards.

All the qmail installations I know patched that about a decade ago to
be a CNAME lookup, because the ANY query caused interop problems.

It's not a very strong argument in favor of ANY.

R's,
John

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