On Fri, Jun 22, 2018 at 5:13 PM, William A Rowe Jr <wr...@rowe-clan.net>
wrote:

> On Fri, Jun 22, 2018 at 4:42 PM, Eric Covener <cove...@gmail.com> wrote:
>
>> > should have broken IDN (punycode) international domain names.
>>
>> those are obviously dashes, not underscores, so not affected at all.
>>
>
> That assertion was a bit extreme :) But on principal, underbars are not
> valid (internet) DNS, but seem widely deployed in the intranet, notably
> a certain M$ who has actively endorsed and promoted them to sysadmins.
>
> I'd say let them pass, in that it shouldn't matter if a_b isn't resolvable
> any more or less than axb is resolvable. There is no ambiguity in the
> designation that I'm aware of.
>

(Sub-delims have all sorts of problematic designations, we really want
to accept a "wildcard" '*' hostname? I'd suggest keep to the known
"unwise" exceptions, and leave it part of the "unsafe" protocol behavior.)

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