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From: Ben Mesander <ben@timing.com>
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Date: Mon, 31 Mar 2003 10:00:28 -0700
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Subject: Re: Allow underscores in DNS names
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Giorgos Keramidas writes:
 > If everyone else supports underscores (I've only tested Solaris and
 > Linux 2.4.20), then perhaps, just for the sake of interoperability
 > with other systems, we should too.

I do not know if this is still the case, but in the past, some MTA
implementations refused to deliver mail to hosts with '_' in the name.

--Ben