SPF is far closer to a "service" than a TXT record. TXT records are
COMPLETELY unstructured, and never, ever should have been defined in the
first place.
SRV records, on the other hand, allow you to distinguish the service
type. SPF *IS* a service, in the sense that it provides functionality
to DNS-querying clients. It is not a service in the sense that it is
not listening on some TCP port somewhere.
Basically, SRV with the "service name" field = SPF obviates the need for
fake subdomains like _smtp_client. We went through all this hell with
HTTP and the stupid www. convention, just because we didn't have the SRV
record when HTTP hit.
Please don't make the same mistake.
-- arlie
-----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 wayne
Sent: Friday, October 10, 2003 2:13 PM
To: spf-discuss(_at_)v2(_dot_)listbox(_dot_)com
Subject: Re: [spf-discuss] new RR type
In <000001c38df4$6a2a7590$0100a8c0(_at_)laika> "Arlie Davis"
<arlie(_at_)sublinear(_dot_)org> writes:
Why not use the SRV record? SRV is a generic service record. SRV was
intended for exactly these kinds of scenarios -- describing a new
service of some kind, without the need for partying on TXT record, and
without the need for an entirely new DNS record.
Unless I'm missing something, SPF really isn't a service, at least not
in the same sense as SMTP, HTTP, NTP, NNTP, etc. There is no daemon
running on a server that has a public port that people can connect to.
As such, I don't think SRV records are appropriate.
-wayne
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