Guy Helmer wrote:
I've been recently looking at DomainKeys, and underscores appear to be
typically used in the domain components for domain keys TXT records
(example below from
http://www.elandsys.com/resources/sendmail/domainkeys.html):
mail._domainkey.example.com. IN TXT "k=rsa; t=y;
p=MEwwPQRJKoZIhvcNADAQCQADOwAwOAIxANPpYHdE2tevfEpvL1Tk2dDYv0pF28/f5MxU83x/0b
sn4R4p7waPaz1IbOGs/6bm5QIDAQAB"
"example.com" is the domain name above. _domainkey.example.com is a
hostname. There are no TLD registries that accept underscore in domain
name registrations, but it's extremely difficult to determine reliably
where the domain name ends and the hostname begins for all TLDs.
This debate is one of the few negative fallouts of the robustness
principle. Since others have refused to be "conservative in what they
send" we are forced to be "liberal in what we accept" (as much as I find
it distasteful on a personal level).
Doug
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