[exim] spec about hyphens in host names

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Συντάκτης: Lutz Preßler
Ημερομηνία:  
Προς: exim-users
Αντικείμενο: [exim] spec about hyphens in host names
Hello,

In 14.23 of the spec in the explanation of dns_check_names_pattern
there is after "which permits only letters, digits, slashes, and hyphens
in components, but they must start and end with a letter or digit." the sentence
"
Hyphens are not, in fact, permitted in host names, but they are found in
certain NS records (which can be accessed in Exim by using a dnsdb lookup).
"

Any reference for hyphens not beeing allowed in host names?
I cannot find any, see e.g. the discussion at
http://www.imc.org/idn/mail-archive/msg04905.html .
Maybe this was mixed up with underscore?

Greetings,
Lutz


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Lutz Preßler  <Lutz.Pressler@???>    http://www.SerNet.DE/
SerNet Service Network GmbH, Bahnhofsallee 1b, D-37081 Göttingen
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