-----Original Message-----
From: owner-spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
[mailto:owner-spf-discuss(_at_)v2(_dot_)listbox(_dot_)com]On Behalf Of Mark
Sent: Wednesday, October 06, 2004 8:48 AM
To: spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
Subject: Re: [spf-discuss] SPF v1 draft for review
Mark Lentczner wrote:
Thank you for your hard work. :)
Let me remind you that the intention of this draft is to codify the
common understanding,
Perhaps you could enlighten me on one thing, though, the new RR type:
3.1.1 RR Types
This document defines a new DNS RR type SPF, type code to be
determined. The format of this type is identical to the TXT RR
[RFC1035].
However, because there are a number of DNS server and resolver
implementations in common use that cannot handle new RR types, a
record can be published with type TXT.
An SPF compliant domain name SHOULD have SPF records of both RR
types. A compliant domain name MUST have a record of at least one
type. If a domain has records of both types, they MUST have
identical content.
An SPF compliant check SHOULD lookup both types.
If I read you correctly, you say, An SPF compliant domain
name SHOULD have
SPF records of both RR types, but MUST at least have one,
which can be of
type TXT, right? But, if an SPF compliant host SHOULD have
SPF records of
both types, then what is the point of having a new RR type?
To allow phase in of the new RR record type, yet still allowing DNS servers
that don't support the
new RR type to participate.
(other than to
double the record, that is). If the TXT record remains a
requirement, then
TXT remains just as "crowded" as before.
No, because if you are a domain that actually uses TXT for something else, you
*can* just publish
the new RR if you choose, allowing you to be SPF compliant, whilst not
overloading your TXT result.
Perhaps the part:
An SPF compliant check SHOULD lookup both types.
Should in fact read:
An SPF compliant check SHOULD use both RR types, starting with a lookup on the
new RR type, and if
not found then proceed to lookup on the TXT RR type.
This is because:
1) since both records *must* be identical, you can stop the lookup once you
find the first result
2) once we get a dedicated RR type, we would want to encourage its use to phase
out TXT usage in the
long run.
Terry Fielder
Manager Software Development and Deployment
Great Gulf Homes / Ashton Woods Homes
terry(_at_)greatgulfhomes(_dot_)com
Fax: (416) 441-9085
- Mark
System Administrator Asarian-host.org
---
"If you were supposed to understand it,
we wouldn't call it code." - FedEx
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