Mailing List Archive

Re: SPF records at AltaVista
Koen Martens wrote in spf-discuss:

> redirect is exactly what I meant

Okay, I'll try to convince my ISP to add something like...

| * IN TXT "v=spf1 redirect=claranet.de"

...for its vanity hosts (= one virtual domain per user,
working as catch-all). But why isn't that the default
for SPF ? In other words, if domain an.example.net has
a sender policy, and if any host.an.example.net has no
explicit sender policy, why doesn't it inherit the SPF
of an.example.net automatically ? Of course this would
result in a second DNS query, is that the only problem ?

Bye, Frank

P.S.: spf-help is now also available on news.gmane.org


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Re: Re: SPF records at AltaVista [ In reply to ]
On Tue, Jun 01, 2004 at 04:00:42AM +0200, Frank Ellermann wrote:
> Koen Martens wrote in spf-discuss:
> > redirect is exactly what I meant
> Okay, I'll try to convince my ISP to add something like...

Good luck :)

> | * IN TXT "v=spf1 redirect=claranet.de"
> ...for its vanity hosts (= one virtual domain per user,
> working as catch-all). But why isn't that the default
> for SPF ? In other words, if domain an.example.net has
> a sender policy, and if any host.an.example.net has no
> explicit sender policy, why doesn't it inherit the SPF
> of an.example.net automatically ? Of course this would
> result in a second DNS query, is that the only problem ?

The point is that it's not always the case that *.domain.net is owned by
the same entity as domain.net itself. Consider my provider, xs4all.nl.
They own xs4all.nl of course, but sonolo.xs4all.nl resolves to my static
ip, and thus is in some way my domain. Whereas www.xs4all.nl is not.


Koen

--
http://www.sonologic.nl/

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Re: SPF records at AltaVista [ In reply to ]
Koen Martens wrote:

>> Okay, I'll try to convince my ISP

> Good luck :)

Thanks, it worked:

vanity.claranet.de text = "v=spf1 redirect=claranet.de"
xyzzy.claranet.de text = "v=spf1 redirect=claranet.de"
foobar.claranet.de text = "v=spf1 redirect=claranet.de"
claranet.de text = "v=spf1 ip4:212.82.225.0/24 -all"

> The point is that it's not always the case that *.domain.net
> is owned by the same entity as domain.net itself.

ACK, e.g. not all *.com and *.net belong to BorgSolutions resp.
VeriBorg. And in that case you shouldn't play with wildcards.

> sonolo.xs4all.nl resolves to my static ip, and thus is in
> some way my domain

But obviously they allowed you to define your own SPF record:

text = "v=spf1 a mx ptr -all exp=spfexp.sonologic.nl"

BTW, what's the exact meaning of this PTR ? Bye, Frank


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