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Date:      Thu, 19 Jul 2001 15:20:38 +0300
From:      Veaceslav Revutchi <sl@zeus.dnt.md>
To:        freebsd-questions@freebsd.org
Subject:   underscore in hostnames (dns problem)
Message-ID:  <20010719152038.A16848@zeus.dnt.md>

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Troubleshooting a mail problem today I discovered that the MX record
for the destination address has an underscore in it, something like
that: acb_def.domain.org

when I use dig it reports the IP for this weird hostname, but
if I try to ping or telnet to it I get respectively:

ping: cannot resolve abc_def.domain.org: Unknown server error
abc.def.domain.org: Non-recoverable failure in name resolution

ping and telnet is able to resolve the name on linux though.

Do I have to contact those responsible for that domain and 
point them to the problem of is underscore allowed in zone file?

thanks,
slava

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