SPF records in reverse zones?
marka at isc.org
Wed Dec 5 23:55:42 UTC 2012
In message <alpine.BSF.2.00.1212052345240.58673 at bikeshed.isc.org>, Dan Mahoney w
> On Thu, 6 Dec 2012, Karl Auer wrote:
> > This may be a silly question, but are SPF records supposed to be
> > supported in reverse zones? I'm thinking of a mail server that has no
> > entry in the DNS.
> Well, most mail servers will reject such a server (i.e. one with NO rdns).
> However, there's another possible interpretation of your request.
> SPF records go in the zone of the envelope-sender. So if your server's ip
> is 126.96.36.199, and your mail address REALLY is
> bob at 188.8.131.52.in-addr.arpa, then the reverse zone would also need to
> have an MX and possibly an A record, in order to route mail to it, which
> goes a far cry from being "a server that has no entry in the DNS".
> I can't even imagine what spamfilters would think of such an address. :)
There are some people who actually do that.
> -Dan Mahoney
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Mark Andrews, ISC
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PHONE: +61 2 9871 4742 INTERNET: marka at isc.org
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