SPF records in reverse zones?
dmahoney at isc.org
Wed Dec 5 23:52:43 UTC 2012
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 220.127.116.11, and your mail address REALLY is
bob at 18.104.22.168.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. :)
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