On Nov 20, 2003, at 8:17 AM, Jasper Wallace wrote:
On Tue, 18 Nov 2003, Philip Gladstone wrote:
2 For budget DNS providers, let customers use CNAME to get from
_spf.domain1.com to _spf.maindomain.com where maindomain.com is
hosted on an enlightened provider like zoneedit.
Appoligies to Marc, i've been sitting on this for a while:
http://pointless.net/~jasper/spf/
As you can see, if a web based dns provider dosn't allow TXT records,
they
don't allow underscores either.
If we do end up with a spf specific domain name it will have to also
be a
valid domain name.
If you are implying that underscore is not valid in DNS then you are
confused. RFC952 says they are not allowed in hostnames, but DNS
allows them just fine[1]
Zeroconf for example uses them for a namespace escape to make sure they
don't collide with a valid hostname. We should use _spf for the same
reason.
That some web based dns providers aren't complete, doesn't really
change that.
- ask
[1] http://www.faqs.org/rfcs/rfc1123.html 6.1.3.5 Extensibility
http://www.faqs.org/rfcs/rfc2181.html 11 Name syntax
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